OMG....OK i am new to this ro thing...
i didnt really know which membrane was what and i thought the 1 micron was the hefty$$ one, but the 1 micron is relatively cheap.
though for a little more invested, as suggested to me, adding a 5 micron should extend the life of the following filters and save you some money in the long run.
thanks for all the info...atleast now i am an educated ro idiot!!
