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I was unaware that cat litter could be used as a calcium source. Over at pinguicula.org they list "marly calcareous detritus" as a soil ingredient for many species but never specify what they use to fill that requirement.
I was going to try kitty litter once upon a time, but the only non-scented, natural stuff I could find was made of a soft clay. After a soak in a dish overnight, it turned to mud by just squeezing it between your fingers. Good test to do with any litter brand if you're unsure whether it's suitable as a soil component or not.
Some new cat litter at the grocery store turns to a white mush. You want the older type grey-yellow clay, non clumping and non scented as mentioned above.
That has worked best for me.
I have used what is called APS, suggested by some hobbyists. I thought it was good, at first, but later on it wasn't as effective. It's a clayey medium.
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