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Old 01/11/2008, 01:41 AM
Icefire Icefire is offline
Phyto tank master
Join Date: Jan 2007
Location: In Quebec, Canada
Posts: 2,342
If you use 2 membrane with the correct 4:1 ratio you should get the same life as using a single membrane if you are still in spec with the manufacturer. Localy I have 125ppm TDS, IF I would use 2 membrane, I would have 150ppm at the second, not very high still and I doutb it would change something.
2 ocelaris 1-1.5", 1 bandaii cardinal, 1 yellow watchman goby

1 pep. shrimp, 10 nas, 1 astrea , 1 cerrith snails

Some softys

PH 8.1, Alk 11, NH3/4, NO2, NO3 0, Temp 77-79F, SG 1.025