please view our website to learn more Household R.O. System 1. 50,70,80 GPD 2. 5 Filtration Stage 3. Auto flush or manual flush Ⅰ- Manual Flush Model Ⅱ- Automatic Flush Model A 18s Auto Flush Valve B Micro-computer control Ⅲ - Automatic Flush & ABS vessel 4. You can choose different filters for special needs Filtration Stage First Stage:--------- The PP Pre filter removes rust, sand, clay and floating substances which are bigger than 10μm. Thus it enables to generate effective performance by carbon filter.. General total purified water capacity :9000 L, suggest to change for 3 month. Second Stage---------The carbon particle filter can remove some organic chemicals, pesticides, the floating substances, remnant chloride, unpleasant taste, odors or colors and as well as heavy metal particles. General total purified water capacity: 12,000L,suggest to change for 6 month. Third Stage- --------- The carbon block filter can remove some organic chemicals, pesticides, the floating substances, remnant chloride, unpleasant taste, odors or colors and as well as heavy metal particles. General total purified water capacity : 12,000L,suggest to change for 9 month. Fourth Stage------------Reverse osmosis (RO) can efficiently remove dissolved salts, heavy metals. bacteria and some organics which are bigger than 0.001μm ,and the desalinations is more than 98.5%. General total purified water capacity : 18,000L,suggest to change for 12~18 month. Fifth Stage-----------Small post carbon, remove some organic chemicals,, unpleasant taste, odors or colors, heavy metals and make the water taste better. General total purified water capacity: 12,000L,suggest to change for 12 month. please view our website to learn more