View Full Version : How to determine which membrane to change

10/09/2016, 06:14 PM
I bought a SPECTRAPUREŽ MAXCAP RO/DI SYSTEM W/ MANUAL FLUSH - 90 GPD last october. It has been used for the past 10 months and produces approximately 60 gallons of RO/DI water a month on average.

I am using the green flow restrictor tubing and the inlet pressure is 60.

My current TDS meter reading are 238 at inlet, 7 at RO outlet, 3 after DI-MC and 2 outlet.

Which membranes would be suggested to be replaced at this time and why?

10/09/2016, 08:13 PM
Your membrane is good at 97.1% rejection.
The DI-MC needs to be replaced because it (003) is about half of the RO (007)
and the DI-SB needs to be replaced because it is not zero (000).
Probably also need new prefilters.

Scott at SpectraPure