The Pond Guy UltraUV EPA-Registered UV Pond Water Clarifier & Fish-Safe Algae Treatment, 18 Watt

Keep your pond clean—not green—all season long with the powerful Pond Guy UltraUV™ Pond Clarifier for pond algae control in outdoor ponds. This high-performance UV pond clarifier uses ultraviolet light technology to eliminate unsightly green water caused by planktonic algae. It’s the perfect addition to your pond equipment arsenal, especially for water features exposed to full sunlight and nutrient pollution, which can accelerate algae growth.

This pond UV light system features a unique vortex design that twists incoming water around the ultraviolet bulb, maximizing exposure and treatment effectiveness. It acts like a water sanitizer, polishing your pond water before it passes into a biological filter or flows back into the pond. For best results, pair with a pond filter, aerator, and pump (each sold separately) to enhance overall pond health.

The Pond Guy UltraUV™ Pond Clarifier is ideal for small outdoor fish ponds ranging from 1,000–5,000 gallons. It connects easily to 3/4", 1", 1-1/4", and 1-1/2" kink-free tubing with included step-down fittings, and can clarify water within 48 hours when used with the appropriately sized pump. This pond ultraviolet light is especially suited for ponds exposed to full sun, helping combat algae blooms without harming fish or aquatic plants. Maintenance is simple—just clean the quartz sleeve as needed and replace the UV bulb annually. For optimal performance, use alongside mechanical filtration and aeration to improve water circulation and promote a balanced pond ecosystem.

Optimize Your Pond Ecosystem
As part of your complete pond equipment setup, this UV light unit improves circulation and clarity without harming beneficial bacteria when properly sized. Water flow rate matters, as too fast and algae cells may escape UV exposure, but too slow and you risk sterilizing your pond (including the good microbes). Consider our pre-matched combos with a compatible SolidFlo pump for the perfect balance.

FAQ

Will this unit get rid of ALL forms of algae?
No. The Pond Guy UltraUV™ Pond Clarifier is designed to treat green water problems caused by planktonic algae. It will not treat string or filamentous algae or bottom-growing Chara.

Does the UltraUV™ require a separate water pump?
Yes. When sizing a pump for a UV clarifier, you want the flow rate to be just right. Each manufacturer has different recommendations for their unit, so your best bet is to choose a pump close to, but not greater than, the maximum flow rate. If you want to remove the guesswork from water pump selection, consider our combination options, where The Pond Guy UltraUV™ is sold with the appropriately-sized SolidFlo pump.

What kind of tubing does this unit connect to?
The unit has step-down fitting connections that offer options for use with 3/4", 1", 1-1/4", and 1-1/2" kink-free tubing (sold separately). Fittings can be cut down to the largest connection that will work with your plumbing.

How long does the bulb last?
We recommend changing your UV bulb once per season to ensure optimal performance.

Does the UV clarifier need a cover?
We recommend covering the UV unit with a faux rock to protect it from the elements and harsh weather.