HALF OFF PONDS Shock Wave 36W In-Line UV Clarifier for Ponds — 36W Bulb, Fits 2.5" Housing, Up to 4,000 Gal

The HALF OFF PONDS Shock Wave 36W in-line clarifier is a compact UV light unit designed to reduce green water and suspended algae in ponds up to 4,000 gallons when paired with proper mechanical and biological filtration.

If your pond or water feature suffers from cloudy, green water or suspended algae, the Shock Wave 36W offers an in-line ultraviolet clarifier that integrates with existing plumbing to help improve clarity. It’s built with a durable 2.5-inch outer housing, quartz sleeve, and a 36-watt UV bulb controlled by a 120V transformer. With suggested flow rates and straightforward installation, it’s a practical option for backyard ponds, water gardens, and koi systems looking to cut down on maintenance and make the water more visually appealing.

How does the Shock Wave 36W help clear green water?

The clarifier uses UV light to treat water as it flows through the unit, damaging microscopic algae and other suspended organisms so they clump and can be removed by your filter. It works best when placed after mechanical filtration so larger debris is removed first and the UV has maximum contact with fine particles.

• 36-watt UV bulb providing up to 9,000 operational hours before replacement
• Recommended flow range of 1,200–2,400 GPH for effective exposure
• Optimized for ponds up to 4,000 gallons in conjunction with filters
• Quartz sleeve protects the bulb while allowing efficient UV transmission

Where and how should I install this in my pond system?

The unit is designed for in-line installation within existing plumbing so water runs through the 2.5" housing and past the quartz sleeve and bulb. It’s commonly mounted on a solid surface near the filtration equipment and connected with the included graduated barb fittings to match your hose or pipe size.

• Includes barb fittings from 0.75" to 1.5" to fit typical hoses and PVC
• 22-foot total cord length and 120V transformer for convenient placement
• Best positioned after mechanical filters and before biological stages
• Simple inline mounting reduces the need for extra plumbing adapters

What maintenance and lifetime can I expect from the clarifier?

The Shock Wave system minimizes day-to-day upkeep by targeting microscopic algae, but periodic checks and bulb replacement keep performance optimal. The quartz sleeve should be cleaned when buildup occurs, and the 36W bulb is rated for roughly 9,000 hours, with a visible glowing indicator to let you know the lamp is operating.

• Bulb life approximately 9,000 hours before replacement
• Quartz sleeve is removable for cleaning to maintain UV efficiency
• Durable outer housing designed for long-term outdoor use
• Manufacturer maintenance videos available online for guidance

Will this clarifier fit my pond size and pump flow?

To perform well, match the Shock Wave’s flow recommendations to your pump and pond volume. It’s engineered for ponds up to 4,000 gallons when used alongside mechanical and biological filtration, and it delivers best results when flow is held within 1,200–2,400 GPH.

• Ideal for ponds up to approximately 4,000 gallons with proper filtration
• Works most efficiently at 1,200–2,400 GPH flow through the unit
• Graduated fittings help adapt to common plumbing sizes without complex mods

Who is this for: The HALF OFF PONDS Shock Wave 36W is aimed at homeowners, pond keepers, and landscapers who need an easy-to-install, in-line UV clarifier to combat green water and reduce filter cleaning frequency. It’s a solid fit for backyard koi ponds, ornamental water gardens, and medium-sized water features that already have mechanical and biological filtration in place and want clearer, more attractive water with less daily maintenance.