WATER PURIFIER WITH DIFFERENT DEGREES OF PURIFICATION

摘要

Water is purified by three successive filters 2, 3, 4, and valves 101, 26 and pump 32 enable water to be delivered to common outlet 7 from the downstream side of any selected filter. Thus water suitable for drinking is filtered by all three filters, while washing water is less purified. Valves and pump are controlled via a control circuit by manual switches. Filter 2 contains a wound fibre element to remove solid particles. Filter 3 contains an active carbon bed followed by a hollow fibre membrane unit. Filter 4 is a reverse osmosis unit which is controlled by a float 30 to maintain downstream storage tank 29 full. Tank 29 may be exposed to ultra-violet light.