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ECFENCING

Advanced Reefer
Location
NJ
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re: ro membrane and when do you replace

When do you replace your RO Membrane? My tds meter reads 2 and when the di membrane is added it reads 0 tds.

Just using the RO water as drinking water.

Thanks in advance.
 

Unresistible Blue

Experienced Reefer
Location
OH
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The RO membrane is really the workhorse of the system. It removes most of the TDS, some membranes to a greater extent than others. For instance, 100 gpd Filmtec membranes have a rejection rate of 90% (i.e., they reject 90% of the dissolved solids in feed water). So the purified water coming from your 100 gpd membrane would be about 40 ppm (a 90% reduction). Filmtec 75 gpd (and below) membranes produce less permeate, but have a higher rejection rate (98%). The life span of a RO membrane is dependant upon how much water you run through it, and how dirty the water is. Membranes can function well for a year, two years, or more. To test the membrane, measure the total dissolved solids (TDS) in the water coming in to the membrane, and in the purified water (permeate) produced by the membrane. Compare that to the membrane’s advertised rejection rate, and to the same reading you recorded when the membrane was new. How do you measure TDS? With a meter like this: http://www.buckeyefieldsupply.com/showproducts.asp?Category=42&Sub=1
Membranes also commonly produce less water as their function declines.
 

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