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Old 08-28-2016, 03:51 PM   #1
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I have an RODI unit that was producing 0-5 tds water. I changed the prefilters and its now up to 10-12 TDS. Is this still and acceptable range for a reef tank with hardy coral or should I be replacing the membrane?

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Old 08-28-2016, 04:32 PM   #2
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You need to be replacing your DI resin when it no longer works...
Depending on your source water level just the RO system with a good TFC membrane could still let some TDS through.
It is De Ionising resins that do the final job...

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Old 08-28-2016, 05:50 PM   #3
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Before you change your DI resin try flushing it through for about 20 minutes and see were reading you get first.

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