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UV light not clearing pond

Pond Light zu Spitzenpreisen. Kostenlose Lieferung möglic Vergleiche Preise für Ultraviolet Light und finde den besten Preis. Super Angebote für Ultraviolet Light hier im Preisvergleich As you may know, an ultraviolet sterilizer is one of the best ways to guarantee clear water when the clarity problem is due to single cell algae making the water green. A UV will not help with filamentous algae. So why would a pond that has a UV still be green. If you are having this problem, it should be easily fixed However, if your pond has a lot of debris in it, the UV clarifier may not function as well. Because it depends on light rays to clarify the water, water initially must be clear enough to allow rays.. A pond owner really shouldn't scrimp on any of the important mechanical components in a pond, such as the pump or filter system. UV light is no different. Remember that to work well, the full gallon volume of the pond should probably pass through the uv pond filter at least once per hour, all day long

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  1. ator Compact Ultraviolet Sterilizer, Clarifier for Aquarium, Pond It's not uncommon to have a UV Bulb that is not inserted correctly, thus the new lamp will not light. The TMC UV Sterilizers and other T5 & T8 have lamp contacts that are easy to make the mistake of thinking the lamp is properly seated when it is not
  2. A properly installed pond UV light may be so effective that the water stays clear even without a biological filter installed. But clear water is not necessarily healthy for the pond because dead..
  3. Bulb or ballast replacements are usually the two most common malfunctions on UV pond lights. If changing either of these components has failed to solve the problem, it is worth checking the electrical supply to the unit. Test the plug point by plugging a different electrical appliance into it and seeing if it works
  4. I recently purchased a UV 15 watt light and installed it in my pond. The water doses not seem to be clearing up and I need to know if I installed it correctly. I installed it vertically with the corded end up. Because my connections are 1 1/2 inch I bushed the 2 inch inlet and outlet down to 1 1/2 inch

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  1. Pump + Filter. Pumps and filters are another reason your pond might not be clearing. (If you don't have a pump and filter, then you have a natural pond and the ideal treatment for filter-less ponds is Natural Pond Klear).The job of a pump and filter in your pond is to assist the water system in cleaning the physical matter in your pond such as debris, dead leaves and organic waste
  2. - don't add a UV filter. the best thing this does is causes suspended particles to clump together, allowing a filter to capture them. it can damage some cells but not by too much. i've never had a clear pond without one, however this one is debatable
  3. While UV will provide clear water it does not filter the pond water. If you don't have enough biological filtration then you may see one algae problem disappear (green water) and another one (filamentous algae) replace it. How long does it take for UV light to kill bacteria in water

If your wish is to have a natural looking pond with lots of plants and a few fish, and if you don't mind your pond to have a somewhat greenish color, you can live without a UV filter. Also, in such a pond with few fish, just adding some more plants can help a lot to clear up the green color As for clearing green water there is nothing better than a properly sized and installed UV light. If you have an outside pond you will at some point be dealing with stained or green water and a UV light is a 100% cure for this. So basically put everyone with an outside pond will need a UV light, and this is the real reason to have one UV light is helpful for various purposes, including its ability to clear green water. It is one of the best methods for clearing the green water in a pond. The green color of ponds is usually a result of a large algae population. The UV light works by damaging these organisms' cells and killing them The UV lights kill the algae, returning clear water to the pond. Initially we weren't clear on how this was installed. I thought it would be submersible, but it IS NOT SUBMERSIBLE. This means that it doesn't hog space in the pond though so that's fine

Installation of a UV clarifier for ponds. Get rid of green pond water once and for all. Complete pond algae control. Check out my blog posts and see how a. Ultraviolet light can kill free-flowing algae that float in the pond's water. Algae blooms in a pond can turn it from clear to thick pea soup in just a matter of weeks or months. If you notice a cloudiness to the water, it's probably best to get a UV light for the pond Technically, a 'uv filter' is not a filter, because it doesn't physically remove the dead clumps from the pond. It only kills the free floating algae, and is usually called a 'clarifier' or a 'sterilizer'. You still need a filter along with it This light destroys their DNA and kills them. The damage caused to the algae's DNA through this light also causes them to flocculate (clump together). Making the algae easier to trap and remove from the pond water. As mentioned before, the UV system does not remove algae from the pond, it simply kills them Ultraviolet Light inactivates the DNA of free-floating algae and other contaminants that pose a threat to your pond and fish. Bacteria and viruses lurk in your pond, even when your water seems clear. Ultraviolet light eliminates these harmful pollutants. Aqua Ultraviolet cares about your landscaping water needs and the addition of an Aqua UV.

The filter box acts as a sewage box and sends purified clear water back into your pond. According to Phil many problems with UV clarifiers are brought on by a lack of simple maintenance and care. Phil oversees any returns - products that are sent back to Swell by customers who think their kit is not working Ultra violet light is one of best garden fish pond inventions ever. It kill suspended algae and ensures clear pond water year in year out so long as correctly sized and installed. Lamp must be changed every year this is only maintenance required. 4 watts for ponds up to 1,000 litres and 8 watts for up to 5,000 litres in volume Although the algae that create green water are too small to be filtered out, all is not lost since the advent of ultraviolet (UV) light treatment and ultraviolet clarifier (UVC) units. UV units are available as separate items or integral to a filter system, but however they're supplied, the principle is the same Tetra Pond UV Clarifier: https://amzn.to/3kt5pNKAmerica's Best Koi & Goldfish Food: https://amzn.to/2CALBo6 Pond Water Neutralizer: https://amzn.to/3c9ZAC1..

UV pond filters kill algae and bacteria, which means you need an additional filter to get it out of the water. Additionally, a pond UV light filter will not help to get rid of string algae, which does not travel in the water column and is therefore not exposed to the UV light 5W UV-C Algae Bloom Clean Light for Aquarium Water Clean Green Clear Waterproof Clean Lamp for Pond Fish Tank Sump Swim Pool (5W 6.9inch) 4.4 out of 5 stars 352 $16.98 $ 16 . 9 The many advantages of UV sterilization make it a very attractive option for algae control. First, it is a physical treatment, so it does not change the water chemistry of the pond. Second, it is very easy to install. Third, the treatment takes place outside the pond, away from the fish and plants

UV clarifier units consist of a tubular fluorescent bulb that emits UV light. Because UV light is harmful to the human eye, the bulb is enclosed in dark, opaque housing. Here's how they work: Pond water enters through the clarifier's inlet tube and travels around the UV light. The UV light kills the suspended algae, causing them to clump. The Savio UV lamp is not operating. The transformer is not plugged - Check the plug. If the GFCI switch has tripped, reset it. If this occurs often, please consult an electrician. The UV bulb has blown - Bulbs need to be replaced every so often depending on usage. You can order replacement lamps from one of dealers The UV Pond Clarifier can easily be installed in or out of your pond. The included 9W UV bulb lasts up to 8,000 hours. We recommend changing UV bulbs yearly for optimum cleaning performance. The UV indicator light and clear adaptors allow you to see the unit is running. Connects to a pump outlet with a 1/2, 3/4, or 1 in. ID tubing Installing a UV pond light into your garden installation is a fantastic way of reducing pond algae. If your pond has UV pond lights fitted but algae still seems to be growing at a steady rate, there may be a problem with your units. Algae build-up is most easily noticed by water changing color to a dirty green UV light not working - new pond owner struggling. I moved into a new home with a large pond and lots of goldfish plus one Koi carp. I have little idea what to do but have mastered the basics for the pond pump, air pump and filters. The UV light isn't working - checked the power supply, changed the starter motor and have tried 2 new bulbs but.

A UV Clarifier is a piece of equipment that treats your pond water with concentrated UV light, which helps keeps the water crystal clear. Murky water is often caused by single-celled algae floating in the water. The UV light kills this certain type of algae which greatly increases water clarity once gone My UV bulb doesn't turn on when I plug in the unit. The following instructions are for the Emperor 25W, 40W and 80W HO UV sterlizers. Never plug in or view a UV bulb that is outside of the unit. Damage to your eyes and skin will occur. The UV unit has a viewing window that filters out UV light

8 Watt UVC Replacement Bulb | Garden Ponds

Not this specific series. Does the UV light have any residual effect to the fish? As a sterilizer, your Aqua UV system will keep your pond or aquarium water crystal clear, plus you will have the normal in a pond. The UV does not control this type of algae If a UV is sized for sterilization then you can have crystal clear water even without plants in the pond, although the plants will certainly make for a healthier pond. Also, there are differences in the efficiency of the UV light from one brand to the next. 25 Watts from one company may not be as efficient as a 25 watt from another company To best clear up 55 gallons of green aquarium water you'd need a UV sterilizer with a light bulb of between 7 and 10 Watts: The GKM UV sterilizer may work best for medium-sized fish tanks. It has a 9 Watts UV lamp that will completely filter and clear up the water in a 55-gallon aquarium in about 3 days This article is a full guide on how you can make your pond water clear again. The fastest way to clear brown water from your pond is to put activated carbon in the pond. The activated carbon attaches itself to unwanted materials and tannins in the water, thereby removing them. I can recommend Marineland activated carbon which you can purchase here The TMC Pro Clear UV 30 watt & 55 watt uses clean and efficient ultraviolet light to destroy the green, single-celled algae which make garden ponds murky and unattractive. As no chemicals are used, there is no danger of pollution or over treatment of the water and sensitive plant and pond life is not affected

3 Ways to Care for Your Pond - wikiHow

Tips concerning ultraviolet lights. Make sure the UV light you select is adequately sized for your pond. A light that is too small for your pond will not effectively clear your pond water. Make sure you change the UV lamp once a year. After one year, most lamps are operating at only about 60% of their capacity The light kills suspended algae (but not string algae) in the water and allows you to easily remove any algae detritus. UV clarifiers can be attached to either mechanical or biological filters. UV light is harmful to human eyes, so the UV bulb will be situated within a case. Do not disassemble or remove the case from the UV clarifier Are you looking for best pond uv light, we've consulted top experts who has in-and-out knowledge about the pond uv light. We choose the top most quality product, which comes with amazing features you've never heard before. We have filter more than 100+ of product to give you top 10 list of best pond uv [ UV should be on for 24 hours per day. Consult the recommended flow rates on the packaging. If water flow through the unit is too great, the contact time with the UV rays may not be long enough. Slow down flow with a controllable pond pump, or a ball valve. Check the pond volume calculation to enure that you have the right size of unit

Troubleshooting Ultraviolet Lights - Premier Pond & Water

My UV Clarifier Isn't Keeping My Water Garden Free of

UV-C PL Lights. If your UV-C Filter has been continuously used during a pond season, its light output will have decreased. It is advisable then to replace the light. Velda has a wide assortment of lights, ranging from 5 to 55 Watt. The yield of these lights is 30 % more and their lifetime is 30 % longer than that of common models First, lets name the different components: UV clarifiers, UV sterlizers, and a slang term given to a pump for filter with a UV is a UV pump for UV filter. Keep in mind, pond UVs do not mechanically or biologically filer pond water and therefore must be used with pond filters. All UV devices for ponds have a primary objective of keeping ponds clear UV lights do not kill string algae. String algae is attached to different parts of your pond and therefore will not flow past the UV light. Nualgi Ponds eliminates the need for a UV light and we do not recommend using a UV light while using Nualgi Ponds

I Have A UV Light In My Pond But Still Have Green Wate

  1. The quickest and easiest way to combat green water is to fit a pump, pond filter and Ultra Violet Clarifier. Pond water is pumped through the UVC where ultraviolet light damages and disrupts algae that pass through it. The algae cells are then caught in the mechanical section of the filter, and water quickly clears
  2. e how much light is absorbed at a given time. With UV light for pond algae, you should be able to see a difference in a few days. Unfortunately, as with chemical algaecides, UV filters only hide the water quality problem
  3. Premium Level One UV Sterilizer Resource: AAP/TMC Pond UV-C Sterilizer, Clarfifier. Turnover is sometimes tricky with pond as although it does not need to be high for Green Water control (Once per 2-3 hours), the shape of the pond and more often, flow patterns may not allow for coverage of the entire pond
  4. Step 2: Locate your bulbs wattage. Step 3: Measure your bulb end to end (including pins) to confirm which UV replacement bulb is correct for you. The 2G11 Base 36 Watt UV Bulb is used as a replacement for the following: The Pond Guy Power UV Clarifier and the GreenFree UV Clarifier. Read More ». $29.99

Troubleshooting UV Bulb & Sterilizer Problem Guide for

Shop Pennington Aquagarden UV replacement Pond Bulb For Uv Clarifier in the Pond Accessories department at Lowe's.com. Keep your Inpond 5in1 200 and 300 fighting green water with this 5 W UVC lamp. For optimum results of water clarity, we recommend to you replace your lam In a pond, algae blooms, or green water can be a difficult issue to address safely and effectively. Not anymore! The Aquascape UltraKlear UV Clarifier/Sterilizer uses a technologically advanced T5 high output UVC bulb, making it more efficient than traditional UV Clarifiers

The Disadvantages of a Pond Ultraviolet Light Home

Adding an Ultra violet clarifier (UV or UVC) is another part of the filtration system that will keep the pond looking crystal clear. A UVC is a specialized in-line chamber that exposes unwanted organisms in pond water to a high intensity ultraviolet light The blue glow you see from the bulb is not UV light, our eyes can not see the UV rays emitted and as such the blue is just and indicator that the bulb is on, not a measure of whether it is still give out UV light. To help with the price of bulbs we offer a buy any 3 replacement UV Bulbs and get the cheapest 1 free 3. Mount the UV filter on a dry, flat surface. The filter doesn't actually go in the pond itself. Attach it to a surface outside of the pond, such as on top of the canister pond filter. Then, plug it into a GFI outlet. The filter is waterproof, but refrain from submerging it in the pond The Alpine Ultra-Violet Water Clarifier kills suspended algae with UV light. This easy to use clarifier ensures 100% clarity. As water passes through, the rays of an ultra-violet lamp, that is located inside each unit, eliminates green water by making the algae clump together so it can be removed by the pond's filter. Features 4.5 out of 5 stars. (24) 24 product ratings - 18W 24W 36W 55W PLL TUBE SPARE POND FILTER UV UVC BULB LAMP LIGHT WATT W. £9.95 to £29.99. 1,436 sold

How to Troubleshoot a UV Pond Light DoItYourself

New UV sterilizer not working - Houz

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Can't clear up pond water, have tried everything

Pond plants also provide shade. More shade means less light going into the pond, which means less photosynthetic capability for any algae. Of course, pond plants are a lot nicer to look at than pond scum or green water. UV Filter. Installing an ultraviolet filter is an additional precaution that can help with single-celled algae Get the best deals on Pond UV Filters. Shop with Afterpay on eligible items. Aquarium External Canister Filter Fish Tank Pond Water Filter UV Light 10000 L/H. Aquapro AP5000UV UV COMBO SERIES II PRESSURE FILTER Crystal Clear Pond Water New. AU $399.00. AU $29.99 postage. Only 1 left! OASE Filtral 1500 pond filter with free additional UV. The UV filter system contains a sanitizing lamp. The lamp is housed in a quartz sleeve that allows 99.9% of the UV light to shine out. The UV light cannot leave the sterilization area, so you dont have to worry about UV light entering the pond. This electromagnetic light also removes any organic material that passes through the filter while the. Ensure effective performance by replacing the UV bulbs every two seasons, or eleven months, whether or not the light still glows. It's helpful to keep a record of when the bulb was purchased. Refer to the packaging and instructions on recommended flow rate for water to pass through the clarifier as it relates to the size in gallons of your pond UV is very useful in this regard and we often do recommend it for chronic green water issues, but like every mechanical addition to a pond it does have to be installed and it costs more than just some pocket change. Oh and one other thingif the problem is more like a murky or cloudy water, uv light may not help with that at all

How long does a UV filter take to clear a pond

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Do you really need a UV light for your pond? - Quality

I bought a new UV lamp for a pond filter but I don't see any light from the inspection lens in the lamp holder. I checked the the connection in the socket and I see 240v. Does that mean the ballast is working? I've been reading as much as I can but I'm still not sure indicator on the top of the filter and when the water runs clear the filter is properly flushed. Turn off the water pump, return the grey handle to the work position, turn the pump and UV light on and the filter will continue to clean the pond water. GROUND Figure 1 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 2 Figure 4 Figure 9. 1.2.4 Step 4: Control Algae Growth. 1.2.5 Step 5: Give it time! Cloudy water can make it difficult to see fish, and could be a symptom of a growing water imbalance. Cloudy water can be a bit of a nuisance for us pond owners, making it more difficult to see fish and giving the water an unpleasant muddy appearance Using the included mounting brackets, the UltraKlear® UV Clarifier is able to be mounted either vertically or horizontally, and the easy-to-remove bulb and quartz sleeve make maintenance simple. Each UltraKlear® UV Clarifier carries a 3-year limited warranty. SKU: N/A Category: UltraKlear® UV Clarifiers. $ 239.98 - $ 359.98

How to Properly Size a Pond UV Light > Hanover Koi Farm

The TMC Pond Clear Advantage UV Clarifier is an effective chemical free way to control green water in garden ponds, designed in green and black to be unobtrusive. Can be surface, filter or wall mounted and supplied with a wall mounting kit, and a filter lid fixing kit for this purpose. Easy access to working parts makes maintenance easy and. The effectiveness of UV light can be hindered if there is light blockage, i.e. a salt encrusted bulb. It can help to prevent future water borne pathogen reoccurrences, once the initial problem as been completely eradicated from the pond. UV light not only kills unwanted organisms, but beneficial ones as well

How Long Does It Take A UV Sterilizer To Clear Green Wate

The UV-C globe must be checked regularly and should be replaced every 12 months. To visually check the globe, look through the clear UV-C indicator on the top of the filter and if the light is working you will see a purple glow. The power cord cannot be replaced. If the cord is damaged, the filter must be discarded Zapp Pure UV Sterilizers from GCTeK are designed for high flow pond applications. Made from 316 stainless steel polished inside and out for max light penetration. Designed to use just 1 high intensity bulb, can be placed horizontally or vertically with a 4 wide body and overload auto shutoff protection. Handles flow rates from 2200-7800 gph and ponds up to 25,000 gallons

Clearing Algae from a Pond with a UV Light - DIY Danielle

• The AllClear™ PLUS Filter Filter is NOT suitable for use in swimming pools, swimming ponds, or other situations where bodily contact is made with the water. Although the AllClear™ PLUS Filter is designed for outdoor use, it should never be submerged in water. Avoid contact with the UV-C light. Light omitted can be harmful to the eyes. As a pond UV clarifier or pond UV sterilizer is used, the sleeve will tend to become caked with various types of gunk. This needs to be cleaned. If it is not kept clean, too little UV light will be allowed to penetrate the water and, thus, the algae will not be killed. Other than that, UV lights are fairly maintenance-free devices Bought this because I needed a new uv light for 2500 gallon pond. Was going to wait until next season, but it got extremely warm here on the east coast again and my pond got cloudy with algae bloom, even though the water was not green. I've paid over $200 dollars for a uv light in the past, so needless to say I was a little hesitant to purchase.

Pond UV Clarification. Combined with good filtration, UV Sterilizers and Ionizers sustain clean and clear water. UV Sterilizers emit germicidal ultraviolet light that's comparable to sunlight to help purify green water caused by free-floating algae. Water with free-floating algae is pumped into the Sterilizers and across the UV lamp A pond water clarifier can help you achieve this without harming your fish. Whether your pond is large or small, we are confident that you will find the perfect pond uv light in our collection. Pond UV Sterilisers Delivered to your Door. As a one stop shop for pond uv clarifiers and accessories, you can rest assured that customer service is at. Aquascape Pond Lights - Warm White. Aquascape Pond Lights - Color-Changing. Biofalls. Skimmer. Skimmer-Parts. Filter Media. Aquascape Filters. AquaBasin. Automatic Dosing System. Fish Care. Replacement parts for UV lights: Sup12971 (10W bulb) Sup12972 (20W bulb) Sup12974 (40W bulb) Sup12981 (10W sleeve) Sup12982 (20W sleeve) Sup12984 (40W. Got green pond water? Clear it fast with an ultraviolet pond clarifier - guaranteed! We have a wide selection of submersible and out-of-pond UV clarifiers that will eliminate microscopic algae and clear your pond - usually in less than 1 week. How An Ultraviolet Pond Clarifier Works Ultraviolet pond clarifiers (UV's) clear pond water by killing the microscopic algae that clouds the water Aquascape UltraKlear® UV Clarifier/Sterilizer. In a pond, algae blooms, or green water, can be a difficult issue to address safely and effectively. Not anymore! The Aquascape UltraKlear ® UV Clarifier/Sterilizer uses a technologically-advanced T5 high output UVC bulb, making it more efficient than traditional UV clarifiers

The PondMax Pressure Filter with UV Clarifier is a high efficiency, triple action pond filtration system, perfect for ponds with plants, fish and other aquatic life. Besides providing biological and mechanical filtration, it has an ultraviolet clarifier that eliminates green water algae, producing crystal clear pond water If you get the right UV light that is matched to your pond size, and you have plenty of water running through it, then within 2 weeks, you will have clear water guaranteed. Phoenix Pond Supply. If you live in the Phoenix valley and want the best products, knowledge, and guidance for having the best water for your pond contact The Backyard Pond If a UV sterilizer is set up correctly, it will clear up your aquarium/pond in a matter of hours/days and no over action from the keeper is needed. See this web page for high efficiency, true UVC Bulbs: High Output UV Bulbs Page 1 from AAP; What are the Categories of Aquarium/Pond UV Sterilizers? Simply put, there are three categories of UV. If you own a pond with or without a waterfall, we suggest adding a custom filter, pump, and UV-light, to your system to increase your chances of having a clear and clean pond. Without the appropriate filtration, you can expect to spend more time than usual cleaning and maintaining your water features which is not ideal Integrated UV green water clarifier guarantees clear water. Low energy, automatic, pivoting LED spotlight to enhance and extend the enjoyment of your pond. Includes Awesome Pond Pods - a quick and easy 5-in-1 water treatment to tackle the most common pond problems. For video and product manuals please see the support page

Pond water can get dirty after a few hours and the filter needs to be in constant operation to keep your water clear. Additionally, the bacteria and microorganisms in the filter foams, which are necessary for biological filtration, die off if the system is not in constant motion UV Clarifiers help control green water and enhance the cleaning action of any Clearguard Pond Filter (maximum of 2 UV Clarifiers can be placed in any Clearguard unit). For Clearguard Filter Model 2700. FEATURES • 9 Watt (15810) UV Bulb • High-Quality Quartz Sleeve • ETL Listed Transformer with 20' Power Cord. PRODUCT MANUA Goplus Pond Pressure Bio Filter 4000GAL W/ 13W UV Sterilizer Light 10000L Koi fish Tank Water Pump Kit for indoor, outdoor or backyard garden easy maintain the right ecosystem. No Matter It Is A New Pond, Or It Has Been There A Long Time. Are You Upset That The Water Of Fish Not Clear,The Pond Easy To Get Moss And The Fish Falls Ill To Die? Here Is Our 4000GAL Pond Pressure Bio Filter W/ 13W. AquaForte UV-C units. AquaForte Stainless Steel Power UV-C T5. Improved version of the popular UV-C unit with stainless steel housing. Now fitted with 3 connections (2 x 63mm & 1 x blind cap), plus 2 special hose tails (32/38/40/50mm) for more installation possibilities! Unit comes with a T5 lamp for an optimal performance (9000 hours)

A UV clarifier is the third stage of this filtration system. It eliminates the single-celled algae that turn the water in your koi pond green. This uses a UV light, which can burn out if used too much. To prevent this, there is a bulb-saver feature that allows you to set the UV to turn on at specific times Blagdon 9W Mini-Pond 6-Stage Box Filter 12000 Litre Model with UV Clarifier Light, for Ponds Up-to 12,000 Litres. 4.3 out of 5 stars. 76. £144.99. £144 Pressure Flo Service Kit 4000 for Pt1728 - 36 W PT1698. $99.99 New. PondMaster 02215 500 GPH Pond Pump With Filter and Fountain Set 1. $135.99 New. Aqua Ultraviolet A50019 Ultima II Pond Filter. $821.80 New. $400.00 Used. Tetra Pond In-pond Skimmer Ps1000a. 4.7 out of 5 stars Blagdon Inpond 5-in-1 2000, 10w Pond Pump and Filter with UV Clarifier, LED Light, 3 Fountain Heads, for Ponds Up to 2,000L 4.3 out of 5 stars 182 £106.84 £ 106 . 84 £125.49 £125.4 TMC Pond Clear 8 Watt Ultra Violet Clarifier. £76.12. 3 - 5 Days*. TMC (Tropical Marine Centre) pioneered the development of the UV Cleansing system and has manufactured them since the late 1970's. This UV8 Watt Pond Clear Advantage works by halting the reproduction of algae. The ultraviolet radiation at a wavelength of 254 nanometers is.