Laguna's 28 Watt UV Sterilizer/Clarifier helps create beneficial water conditions for fish and plants and is guaranteed to eliminate green water in medium to large ponds. The unit features a unique spiral chamber that allows extended water exposure to UV rays, increasing clarifying efficiency by up to 50%. Two universal Click-Fit connectors allow connections to 19, 25, or 32 mm (3/4, 1, or 1-1/4 inch) hosing, making in-line pond installation a snap. The unit also has an LED light that indicates when the UV lamp is on. It can be mounted horizontally or vertically (mounting brackets provided). The Laguna 28 Watt UV Sterilizer/Clarifier is covered by a 3-year warranty, and is EPA registered.