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					Originally Posted by donkey77  no Deionization i wander if i need a new membrain filter | 
	
 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