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|   awesome! thanks Mark!! there was mention of adding a piggyback membrane to improve your gpd. for future reference, do you know where i can pick one up? also, if i were to change the membrane size to a 150gpd (i noticed from the links that were provided that some 150gpd membranes have a very good rejection rate) would i have to do anything special to the unit itself? Last edited by rocco134; 01-07-2010 at 03:17 AM. | 
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