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In the case of Alka Seltzer, sodium bicarbonate and citric acid meet water. The acid free's the carbon. The sodium and citric form sodium citrate, while the carbonate is free'd by the acid.
Using our pH down acids, does the same to the calcium carbonate. I use Nitric in my tank, so the acid free's the carbon, and the nitrogen and calcium left, are cal-nit.
This is a layman's view, but with such simplicity, choosing cheap products to use, might not be hard. IIRC sodium bicarb, is baking soda, and vinegar as the acid, was a school volcano experiment. The interesting bit, might be how to dose this over 24h. Perhaps adding the water, with a dropper and timer. My guess is the tablets are formed with a third item, to bind them, and also offer some resistance to dissolving in 2 minutes. Gelotine might be the slow release tablet goo needed. It will slow the waters ingress, but not stop it. I think making the tabs is a step too far though. Dosing the water seems easier. I have seen drip bags, like a hospital patient might have, used to drip water for plants. China sell such things, for Bush showers. Perhaps the acid could go in the water, in the drip bag. I'm really not using a lot of acid in a tank, to free the carbon from my tap waters impurities. No need for crazy pH to get this going.
Perhaps better as citric in the dust bowl, and water dripped in. If we add the acid in the water, the first water added might be pH5, but then the acid does it's thing, and is gone. Leaving the water. Our second drip of pH5 is now landing on the powder, and the water from the first drip. So our pH5 drip, is watered down. Maybe after a days dripping, we have quite a bit of neutralised water in our bowl, and the pH5 drip is becoming useless. Though.. it is still there. I'm not sure..
It seems many of us have the ingredients in the house already.