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
• 1 inlet & outlet
his 40 watt unit is for large ponds up to 6000 gallons using pumps up to 3000gph. It will clear green water in 6000 gallon ponds with a pump range of 1800gph to 2400gph. It will kill many bacteria in 2000 gallon ponds with a pump range of 900gph to 1200gph.