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RE: profile as substrate
I'm not familiar with the product you are talking about, but gypsum is often
used/sold as clay breaker/conditioner.
Gypsum is essentially calcium sulphate, and is slightly soluble, so will add
some calcium and sulphate ions to your water, which would explain the
increased GH (from calcium) but stable KH (sulphate not carbonate).
HTH
Steve
> I recently set up and planted a tank with the Clay Soil Conditioner.
> Our water is very soft here straight out of the tap, about 35 ppm KH
> and less than 20 ppm GH. In my little test i found that the GH went
> up to 180 ppm, while the KH remained stable. I'll test this newly
> setup tank and see what the levels are.
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