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[APD] Re: adding Calcium Carbonate
>I'd prefer to add it to the sump, so that there is plenty of water flow
>to help the dissolving...
The garden stores sell a crushed CaCO3 product(I think it's crushed
limestone) that they treat acid soil with. You can add that to the sump and let it
dissolve. Hardness will be up in a couple days. If your water is acidic, it
will happen quicker, buffer you up a little pH-wise, and also release a
little CO2 into the water at the same time. It should happen slowly enough,
though, to dreate a sort of automatic dosing for your plant consumption and water
changes. Play around with how much you use.
My daughter set up a 6th-grade science project where we showed water quality
impact from plant material using peat in a box filter and from rocky
streambeds using this crushed CaCO3. It impacted the pH and hardness very quickly.
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