Aeration, ph, and buffering substrate - The Planted Tank Forum
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post #1 of 2 (permalink) Old 07-29-2020, 06:30 PM Thread Starter
Algae Grower
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Aeration, ph, and buffering substrate

Will running an airstone or sponge filter raise the ph of remineralized RO (GH only) such that it is working against a buffering substrate?
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post #2 of 2 (permalink) Old 07-29-2020, 08:46 PM
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Short answer is no.

I have a tank with SL-Aqua substrate in it, using RO water, GH remineralizer (SL-Aqua/Aqualex) and running a sponge filter. Last time I tested the pH (which it has been a while...), the pH was sitting around 5.5 using a Sera test kit.

All an airstone or sponge filter does is to help remove CO2 out of the water column, it does not effect the tannins (humic, fulvic, etc) that the soil releases into the water column.
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