... No need electrical 5.Long life Addlinn's household water filter L2L2 Can adsorption halogen, oils, color, and ... impurities particleFILTER CORE LIFEAccording to differences of water quality, filter core life differently, but can be used ... filter core.(See instructions)MAINTENANCE RECOMMENDATIONSBackwash once a week, at least 10 minutesPRODUCED WATERBetter than the national standard ((Drinking Water ...