Originally Posted by FatherLandDescendant
I tried that brand when we had a cat and it turned into mud on me, good thing I was rinsing it when I found out
I use MGOCPS with a Safe-T-Sorb cap, though the STS does drop the Gh and kH in the tank.
I used the special kitty cat litter mixed with soil and capped with black diamond.(didn't rinse nothing cept the black diamond).
Did not much care what the cat litter did in the mix, and am near certain the soil turned to mud as well.
As stand alone substrate,I might select the safety sorb.