This is a fully submersible unit that controls water-born algae and prevents the spread of disease. · Glowing monitor halo ring visible from any angle immediately shows that it’s working
· Comes complete with 9000 hour, 10 watt lamp, the longest lamp life available
· Also includes water tight quartz sleeve
· Comes with transformer and 18′ grounded power cord
· 1 year limited warranty
· 3/4 inlet & outlet This 20 watt unit is for large ponds up to 3000 gallons using pumps up to 1800gph. It will clear green water in 3000 gallon ponds with a pump range of 900gph to 1800gph. It will kill many bacteria in 1000 gallon ponds with a pump range of 500gph to 700gph.