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Fish Killin' Reef Keeper
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Pelagic, I would think that if the membrane is bad you would get a much higher reading than that.

I just replaced all of my filters a couple months back......prior to the change my RO/DI was about 10 ( I didn't have a tds meter). I replaced all filters and new DI resin and it went down to 0. My water from the tap is about 400 give or take.....out of the RO is about 2 and the DI takes it down to 0.

I am guessing that fresh DI resin would drop that 2 to 0.....I have enough to recharge another canister if you need to use it. Just LMK.
 

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NFMAS
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Discussion Starter · #4 ·
I did get a brute trash can becasue the other can I was using gave a reading of 17 from 2. Brutes are a rip off but are good to have
 

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Well mine is at 002 after a 3 month change out of all 4 of my filters i run a spectrapure, Pre filter, carbon filter, R/O membrain, DI cartridge, but im on a well, Scott told me at Spectrapure dont worry about it until it's at 010, the next thing im going to do is add a whole house filter straight to it that might help a bit.
Brent.

PS, mine is 454 going in and 002/005 out, i cant complain.
Brent.
 

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Water is 42 going in and 0 going out. How often do people flush their membranes or is it even needed?
 

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NFMAS
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Discussion Starter · #9 ·
I flush once a week for 20 sec sometimes twice a week. I dont think I should change my membrane yet. I am going to wait until it hits 10 because 2 is not too bad
 

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120 in, 0 out
 

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A TDS meter measures total disolved solids, this is good. The unknown factor is are the solids good or bad? I like to test for PO4 and Nitrates once in a while also to make sure the DI is doing its job.
Like others have said the Membrane is good for 2-3 years, so if your getting a TDS reading it is getting time to change out your resin and possibly the other filters.
 

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well ours coming in from the house is 48 and o out if I bring it in from the water hose its 370 in and 0 out!!!
 

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