Aqua Guard Stainless Steel Ultraviolet Lights Sentry Stainless Steel Ultraviolet Lights and Lamps are constructed for maximum durability and effectiveness.  They come in a variety of sizes - ranging from 14 watts up to 600 watts - and meet a wide variety of flow rates and water capacity needs. Unlike cheap plastic of PVC units, which can emit vinyl chloride or other toxic chemicals, Sentry's UVs are designed from corrosion-resistant 316-L stainless steel, so nothing is emitted into the water or air. All of our units are made from heavy-duty pipe, not rolled lightweight tubing. This stronger pipe allows for higher psi ratings and long-lasting, rust-free housings. Sentry UVs are polished inside the reactor chamber wall to a highly reflective luster/shine. The reflectivity found in Sentry UV's lights creates more killing power than other units.  75 Watt Ultra Violet Light For Pond Sizing 8,000-13,000 gallons UW-sec/cm2* 15,000   = 42 gpm      UW-sec/cm2* 30,000   = 21 gpm      UW-sec/cm2* 45,000   = 14 gpm      UW-sec/cm2* 60,000   = 10.5 gpm Flow Max GPH at EOL* = 2520 EOL = End of Lamp Life Intake/Discharge Size:  2" Diameter:  4 1/2 Overall Length:  40" Number of Bulbs:  1  150 Watt Ultra Violet Light For Pond Sizing 13,000-24,000 gallons Flow Rates: UW-sec/cm2* 15,000   = 80 gpm UW-sec/cm2* 30,000   = 40 gpm UW-sec/cm2* 45,000   = 26 gpm UW-sec/cm2* 60,000   = 20 gpm Flow Max GPH at EOL* = 4800 EOL = End of Lamp Life Intake/Discharge Size:  2" Diameter:  6 5/8 Overall Length:  40" Number of Bulbs:  2 For more information about Aquatronics Industries products Contact Us