Aqua Ultraviolet Classic 240 Watt UV Sterilizer, Black, 2" Artwork If you purchase a 4000

If you purchase a 4000 Gallon Ultraviolet Pond Filter

19' head: 0 GPH (max head)

A valve located inside the ultraviolet pond filter closes

When you need professional-level water clarity without the hassle

making it an excellent choice for larger koi ponds

Aqua Ultraviolet Classic 240 Watt UV Sterilizer, Black, 2" Artwork If you purchase a 4000Classic 240 Watt Unit, 2", Black, 6 Lamps Ultimate sterilization power for the largest ponds and high demand water features. The Aqua Ultraviolet Classic 240 Watt UV Sterilizer is the most powerful unit in the Classic series, designed for very large ponds, commercial water gardens, and demanding aquatic systems up to approximately 17,000 gallons (with proper flow and turnover). This high output UV C sterilizer rapidly and effectively destroys free