Safe/reliable way to lower pH? (w/o CO2) Peat? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 02-04-2004, 02:47 PM Thread Starter
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First off, CO2 injection won't work--I've tried it and there's too much surface agitation in my tank. That said, is there a safe/reliable way to lower the pH of my water? gh and kh are around 4-5.

Everything I've read about ph-altering chemicals is bad. Is peat filtration reliable? That is, will my pH be stable and if I change the peat, will my pH suddenly change? Does the amount by which the pH change depend on the rate of flow through the peat? Doesn't peat soften the water? I'd rather maintain the hardness and lower the pH.

Thanks--I think my plants would benefit from a lower pH (its currently 7.8). They don't seem too happy at the moment.

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post #2 of 7 (permalink) Old 02-04-2004, 06:15 PM
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First off, is this a planted tank? If so I would deal with the surface agitation problem so to get the plants their essential CO2. Then you will get the added benefit of lowering pH too.

BTW, why do you want to lower pH?

Peat is probably the best method. Alot of people here would say not so primarily becuase it makes KH-pH-CO2 chart invalid. However if your not concerned with getting CO2, than this isn't an issue. However using peat is a delicate issue as there isn't really a exact mesurment to use to get a desired pH - mostly works off trial and error but is somethimes unpredictable.
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post #3 of 7 (permalink) Old 02-05-2004, 01:18 AM Thread Starter
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The pH is 7.8 ... that "cool dude" smiley in the previous post is an accident.

Actually, the pH could be as high as 8.0 ... hard to tell with the kit.

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post #4 of 7 (permalink) Old 02-05-2004, 08:34 AM
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I have to aggree with Rolo here.

Why is it that you can't prevent the surface agitation.

I couldn't afford to go out and get a big canister filter, so I just bought a little powerhead jobby with a smal filtermedia compartment, was less than $10.

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post #5 of 7 (permalink) Old 02-06-2004, 05:54 PM
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Again, I ask, why do you need to lower pH?

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post #6 of 7 (permalink) Old 02-07-2004, 04:16 PM Thread Starter
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Isn't 7.8 - 8.0 a bit on a high side? I've read that plants prefer a slightly-acidic pH.

Also, surface agitation can be reduced but not avoided. This tank has a waterfall and sump system. I wouldn't want to get rid of either feature. It's a paludarium tank so humidity and water volume are both issues. The waterfall (besides being a nice feature) provides some additional humidity and the sump nearly doubles the water volume.

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post #7 of 7 (permalink) Old 02-07-2004, 04:40 PM
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My plants THRIVE in pH of 8.6. If anything I would be concerned about getting more CO2 more than lowering pH, which IME, virtually doesn't matter to plants at all.

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