... of 253.7nm.Maintenance:1. the best working condition-water temperature: 5-50 centidegree-ralative temperature: no more than ... :Our business line FRP tank, Stainless steel tank, water softener, household water purifier, industrial water filter, RO and UF membrane housing, RO system, ... with ISO 9001:2000 of corporation management authentication. Ultraviolet Water Sterilizer 0.5-1GPM