2 to 20 gallons per minute [gpm], 120 to 1200 gallons per hour [gph]- Potable & high purity water applications- 304 or 316 Stainless Steel, electropolished and passivated inside and out- Easy-Off" Retainer Cap for effortless lamp change- Drain Plug for in place drainage of the purifier- Sight port to view germicidal lamp operation- UL Approved Ballasts