The common water purifiers on the market are ultrafiltration water purifiers and reverse osmosis water purifiers, and only water filtered by reverse osmosis water purifiers can be drunk directly. Ultrafiltration water purifier is a little bit is not consume electricity, no waste water, large water output, the price is also cheap, but its purification effect is relatively poor, it is best to be heated before drinking. Reverse osmosis water purifier purification effect is better, high precision, after purification of water quality can be directly drink, very healthy.