CNZ UV clarifier for ponds & aquaria — 36W UVC inline, fits up to 8,000 gal

The CNZ CUV-136 is a 36-watt ultraviolet clarifier that reduces suspended green water and helps maintain clear pond and aquarium conditions for systems up to 8,000 gallons.

Algae blooms and microscopic suspended particles turn healthy water tea-green and reduce visibility. The CNZ CUV-136 fits into existing filtration setups or new builds to help control free-floating algae and improve overall water clarity without disrupting pumps or filters. Compact and versatile, this clarifier is engineered for easy plumbing connections, flexible mounting, and straightforward bulb replacement to keep outdoor and indoor water features looking their best.

How does the CUV-136 clear green water?

Ultraviolet clarification uses UVC light to neutralize microscopic algae and pathogens that remain suspended and cause green water. Water flows past the lamp inside the unit so organisms are exposed to the light, which helps them clump and be removed by your mechanical or biological filter.

• 36-watt 2G11 UVC bulb for targeted exposure
• Designed to treat ponds and aquaria up to 8,000 gallons under typical conditions
• Inline plumbing ensures water passes directly by the UVC source
• Helps reduce odors associated with suspended organic material

What installation options and fittings are available?

The unit connects to common pump and tubing sizes and can be positioned to suit your layout. CNZ designed the housing with multiple inlet/outlet sizes and a slim format so it fits beside filters, under benches, or inside pump shelters.

• Universal fit for 3/4", 1", 1-1/4", and 1-1/2" pump/tubing fittings
• Mountable vertically or horizontally for flexible placement
• Compact dimensions (19" x 5.5" x 3") for tight spaces
• Quick-connect plumbing reduces installation steps

What maintenance does the clarifier need and how long does the bulb last?

Routine upkeep is simple: replace the UVC bulb periodically and keep the exterior clean and shaded for longevity. The included transformer cord is weather-resistant, but the unit itself should not sit in direct sunlight continuously to avoid premature wear.

• Includes a 2G11 36W bulb rated up to ~8,000 hours of operation
• Manufacturer recommends bulb replacement every 6–11 months for consistent clarity
• 15 ft weather-resistant transformer cord included for safe placement
• Wipe housing and inspect fittings during seasonal checks

How will the CUV-136 fit into my pond or aquarium system?

The clarifier is intended to work alongside mechanical and biological filtration: it improves water clarity while your filter removes the clumped particles. It’s suitable for both retrofit and new installations where space or plumbing routes are limited.

• Works in-line with your existing pump and filter circulation
• Vertical or horizontal mounting adapts to different setups
• Helps filters collect algae more effectively after UVC exposure
• Compact shape lets you place it near pump intakes or filter canisters

Who this is for: The CNZ CUV-136 is aimed at hobbyists and landscapers who want a straightforward, space-saving UV clarifier to control green water in ponds and larger aquaria up to 8,000 gallons. Choose this unit if you need a reliable inline UVC device with universal plumbing fittings, easy mounting options, and a replaceable 36W bulb for seasonal maintenance. It’s a practical addition to filtration systems that need improved clarity without major plumbing changes.