UV and Bio Pond Filter 15 watt Replacement Bulb for Large Filte

Combines UV and Biological filtration for crystal clear, purified waterFrost-proof, quartzless UV chamberIncludes SUPRA bio mediaClear water guaranteedUV and Bio Pond filters guarantee clear, purified water at an attractive price. UV light?precipitates the green free-floating algae. The easy rinse mechanical filter system then traps algae and larger particles for removal. Bio-filtering then removes lethal ammonia and nitrates, producing a healthy environment for your fish and aquatic inhabitants. UV Bulbs and filter media included. Pump not included.Compact UV and Bio Pond Filter - Meant for small to medium ponds, this low profile filter guarantees crystal clear water and?is easily camouflaged in even the smallest garden. Inlet size - 3/4"; Outlet size - 1-1/4". 7" H x 14-1/4" W x 9-1/2" D. 8 watt for ponds up to 1,000 gallons, 300 gph pump recommended; and 16 watt for ponds up to 2,000 gallons, 200-600 gph pump recommended.Medium UV and Bio Pond Filter - This filter is suited for medium to large ponds and features a removable bio tray with fast and slow flow zones. For ponds up to 4,000 gallons. Multi-size inlet - 3/4" or 1-1/4"; Outlet size - 1-1/2". 13" H x 23-3/4" W x 16-1/2" D. 25 watt UV. 1,200 gph pump recommended.Large UV and Bio Pond Filter - This powerful filter works best in large ponds. It is particularly suited to Koi ponds because of its high efficiency and easily removable media trays. For ponds up to 6,000 gallons, 2,000 gph pump recommended. Multi-size inlet - 3/4" or 1-1/4"; Outlet size - 1-1/2". 21" H x 23-1/2" W x 16-3/4" D. 30 watt UV (2 at 15 watts each).-->UV Replacement Bulbs Replacement UV bulbs for Fish Mate Medium 25W Bio Pond Filter (mfg# 237) and Fish Mate Large 30W Bio Pond Filter (mfg# 239).The lamp UV output reduces over time. After 12 months of UV operation, the UV lamp should be replaced. Please note that the lamp will continue to give off light well after the UV output that affects algae has diminished (or stopped). It is recommend