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Cactus mix is already pH-balanced with calcium carbonate to around 7.0. You don't need to add any more.
I am glad that some have luck with hydrated lime. The form I tried was very pure and so strong that it totally wiped out my entire bed almost overnight. The strong stuff is snow white and burns your nose. The weak stuff at garden stores is a mix of that and regular calcium carbonate.
Just because you found some super weak agricultural grade doesn't mean that is what everyone will find. Pickling lime, one of the most typical forms of hydrated lime, for example will not work well. I don't care how many grows you did with your weak garden lime, the fact is that others may find much stronger lime that hasn't reacted with the air for so long. Calcium carbonate, on the other hand, is much more consistent. You only have to deal with particle size, not how reacted it is with the air because it's stable.
As for using tums or rolaids, that too is a bad idea. Those are usually packed with all sorts of other things, sometimes including sugar and magnesium. Get normal garden lime derived from calcium carbonate sources or a pure form used in wine making.
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