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Old 01/11/2008, 12:25 AM
Roland Jacques Roland Jacques is offline
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Join Date: Mar 2003
Location: atlanta
Posts: 2,618
Originally posted by Icefire

Most membrane will last over 5-7 years if your TDS are below 500 if I remember correctly. If you have a higher TDS, like AZDesertRat, I would use a 50% rejection membrane to reject most of the salt and have better life from the 99% membrane. I think they sell low ratio membrane for that.
This i do not agree with. this would not work in series.

I assume you are suggesting taking the "good water" from the first 50% membrane and run it as the tap/source water to the 99% membrane. I don't think this would work. besides having higher waste water than a straight 4:1. i dont think you would have the pressure needed to run the second membrane.

I think this is a different subject and It is just mudding the water.