MaxPro Ultraviolet Clarifiers are constructed of durable stainless steel. These durable professional grade UV sterilizers can effectively eradicate "pea soup" green water and algae blooms in your pond or water garden. Available in three models -- 40 watt, 55 watt and 75 watt, multiple units can also be run inline for extra large ponds. Attachments included allow these units to easily connect to standard or flex 2" PVC pipe or flexible tubing commonly used by water garden enthusiasts. Features a 3" housing for maximum flow rates. Ultra efficient UV lamp designed to last 9,000 hours.