RO water with high PH? (new to RO) - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 06-23-2005, 04:12 PM Thread Starter
EoS
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RO water with high PH? (new to RO)

Setting up a small shrimp tank and we decided to use RO water from WallyWorld (cheap). We added Kent Liquid R/O Right when we set up the tank. Tested the water after the tank running for a few days, and the PH is between 7.4 and 7.8 on a high range test! We left some to sit for 24 hours out of the bottle, and it tests the same! Yes we checked the label - it's RO, not spring water. KH and GH are zero as expected.

Shouldn't RO be neutral or slightly acidic? How can we get the PH down? This is a tiny (5.5G) , non-co2 tank.

thoughts?

Thanks,
Sean G.

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post #2 of 6 (permalink) Old 06-23-2005, 05:52 PM
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wouldnt make sense for the pH to be that high. especially with a KH of 0. My RO water comes out at 5.0pH, with 0 TDS,KH,GH.

I would suspect that your testkits are not working correctly, unless their is some misterious additive to the water from the store you purchased it. Not sure what though since KH and GH are remaining zero.

Keep in mind that having a 0 KH is a disaster waiting to happen. unless you plan on doing daily 50%+ water changes then you will have a pH crash within days. You should look into bumping both KH and GH up.

Which begins up another point. You said that GH stayed 0 after using RO right? Should have increased as that is what RO Right does... increases GH.

Cliff
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post #3 of 6 (permalink) Old 06-23-2005, 06:17 PM
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well, I suppose the RO right additive contains GH and KH, as it should. You should measure gh/kh in your tank after RO right. Straight RO with 0 kh/gh is not good for anything, of course.


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post #4 of 6 (permalink) Old 06-23-2005, 06:21 PM Thread Starter
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The 0 KH and GH readings are from the bottle. Sorry I didn't word that well.

Tank water (with RO Right) is:

GH=2.5
KH=1.5-2

The PH is 7.4-7.8 on a high-range test kit. We tested in a normal range kit as well and it's on the highest bar (7.6). PH tests the same with both kits from the tank and the bottle.

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post #5 of 6 (permalink) Old 06-23-2005, 06:25 PM
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PH of straight RO does not mean ANYTHING, because without any buffering capacity (KH), it can be all over the place: with addition of small amount of acid(CO2 dissolved from the air, for example), it can drop to very low levels, and if the plants use up a little CO2, ph can shoot through the roof. That's why you need something like RO right to stablize the ph with some buffering capacity. Your ph measurements are as expected.


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post #6 of 6 (permalink) Old 06-24-2005, 06:20 AM Thread Starter
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Gotcha, thanks. We'll keep a close eye on it....

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30g, 4.6 wpg, 100% Eco-complete, Eheim 2026, Pressurized CO2 w/Milwaukee regulator and SMS122 PH controller, Turbotwist 6x UV Sterilizer

16g high, 4.6 wpg, 100% Eco-complete , Eheim ECCO 2231, Hagen Nutrafin CO2, TurboTwist 3x UV Sterilizer

JBJ Nano-cube 6 - quarantine tank for now...
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