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|   Depends on the age of the membrane. should be good for about 3 years depending on the input water. typically i have found my membrane (even when brand new) leaves about 5 ppm tds. the dioonization will remove the rest of it. (not sure if im allowed to post links but) Here is a link to a good system to ensure you have good clean water for a reasonable price. http://www.bulkreefsupply.com/brs-4-...tem-75gpd.html It includes a tds meter so you can keep an eye on the quality of the output water Last edited by nitro069; 02-05-2013 at 01:37 AM. |