Qualirey 12W UV Pond Clarifier for Koi Pond & Aquarium — In-line Stainless Steel with Quartz Sleeve

The Qualirey 12W UV Pond Clarifier is an external in-line ultraviolet unit that reduces green water and improves clarity for koi ponds, aquariums, fountains, and cold plunge systems.

This compact in-line UV clarifier uses a 12-watt UV lamp inside a stainless-steel chamber and quartz sleeve to expose circulating water to germicidal ultraviolet light. Built for external circulation, the unit connects between a pump and tubing to treat water without chemicals. It arrives as a kit with mounting clamps, a quartz sleeve, a UV bulb, and an electronic ballast so you can install it quickly on most pond and aquarium return lines.

How does the Qualirey UV clarifier improve water clarity?

The clarifier treats suspended single-celled algae and other microorganisms by passing water through ultraviolet light, which helps reduce visible green water and cloudiness. It does not filter out debris, so pairing it with mechanical or biological filtration gives best overall results.

• 12W UV lamp for continuous exposure of circulating water
• Quartz sleeve protects the lamp while maximizing UV transmission
• Stainless-steel chamber designed for durable, external connections
• Works passively with pump-driven flow—no chemicals required

What flow rates and installations are recommended?

This device is rated at approximately 0.2 tons / 1 GPM equivalent for optimal UV exposure; actual performance depends on pump strength and water clarity. Install the unit externally in the return line so the ballast and power connections remain dry and accessible.

• Connect inline between pump and return/tubing—do not submerge the unit
• Confirm tubing size and direction of flow before installation
• Use PTFE thread seal tape for secure connections to avoid leaks
• Keep the ballast elevated and dry; secure with the supplied mounting clamps

What components are included and what maintenance is needed?

The package contains the stainless-steel clarifier body, quartz sleeve, UV bulb, electronic ballast, and two mounting clamps. Routine upkeep includes periodic cleaning of the quartz sleeve and annual lamp replacement to maintain UV output.

• Included: quartz sleeve, UV bulb, ballast, and mounting clips
• Clean sleeve when buildup reduces light transmission
• Replace UV bulb per manufacturer guidance or when output declines
• Inspect seals and fittings regularly to prevent leaks

Is this unit safe and what should I avoid?

When installed correctly for external use, the clarifier is safe for household and covered outdoor applications. Avoid direct skin or eye exposure to the UV lamp, and do not operate the unit fully submerged or with the ballast exposed to moisture.

• Do not submerge the clarifier body or electronic ballast
• Avoid direct contact with the UV lamp—handle with care
• Keep small parts and pointed items away from children
• Use in covered or sheltered locations if installed outdoors

Who this is for: The Qualirey 12W UV Pond Clarifier suits hobbyists and small-pond owners who want to reduce green water and support clearer viewing without chemical treatments. It's appropriate for aquariums, koi ponds, fountains, small water features, and cold plunge circulation systems when paired with suitable pumps and pre-filtration. Choose this unit if you need a compact, externally mounted UV solution with stainless-steel construction and an included installation kit for quick setup.