1. Auto power cut-off when filter, extends pump duration.
2. High efficiency, silence booster pump.
3. High defective RO membrane
4. faucet
5. 5stages
5 stages-- 1st:PXV0520 5micron PP sediment 2nd:CXVT3320 GAC filter 3rd:CXVCTO20-C-UD CTO filter 4th:TW30-1812-100 100GPD RO membrane 5th:SCXV5633 GAC filter With booster pump