Profile: Crystal Quest Mfg. produces water filter systems for residential and commercial purpose. Our residential water filtration products include countertop water filters, undersink water filters, faucet mount & pitcher water filters, shower filters, refrigerator water filters, ceramic water filters, reverse osmosis water filters, water coolers and fluoride water filters. Our ceramic water filters effectively removes harmful bacteria such as e. coli, fecal coliform, salmonella, streptococcus and cryptosporidium. Our water softeners set the standard with a unique design that offers continuous soft water.