Zerowater filter as a replacement for RO - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 09-24-2016, 04:20 AM Thread Starter
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Zerowater filter as a replacement for RO

So I have a bit of a head scratcher here. I bought one of those Zerowater filters thinking it would be a good backup in case an RO/DI filter went down. The water going in the filter is 225 TDS and 7.7 Ph. The water coming out is 001 TDS and 8.8 Ph! How could the Ph possibly raise that much? I figured if anything the Ph would lower to 7 due to the TDS lowering. Does anyone have an explanation for this?

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post #2 of 4 (permalink) Old 09-24-2016, 04:59 AM
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sounds like excellent alkalinic drinking water.

but this guy says his ph dropped after using the filter.

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post #3 of 4 (permalink) Old 09-24-2016, 05:12 AM
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How are you measuring pH? Conductive electronic meters are unreliable with RO, since there's nothing to conduct the current left.

PH of RO is relatively meaningless too, since there are no buffer salts. Add a tiny bit of vinegar and then measure pH again. Odds are you may get a very low pH, since there's nothing to resist the change.
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post #4 of 4 (permalink) Old 09-24-2016, 12:35 PM Thread Starter
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Hmm, I used a pH meter with a diode, so maybe that's to blame then? I'll try measuring it with a good old fashion API kit later today.

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I used the API pH test and it shows the pH to be 6.8, so I guess the problem was with my electronic pH meter.

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Last edited by Darkblade48; 09-25-2016 at 05:46 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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