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.