LMAO! it's a mined material not manufactured, so to have the mineral composition drift slightly from bag to bag shouldn't be so hard to believe. As I originally posted my experience was only a shift of 2dKH and the effect only lasted through a couple water changes. RO water and substrate only in the tank in question overnight before testing. The only reason the tank was flooded is that the stand is installed on thick carpet. I wanted the crush weight to settle into the padding for the final level adjustment.
I know the KH/pH shift was from the EC and nothing else.
Not concerned or bothered by it either,,, it was temporary.
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it
2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g,
2012 update adding table top pleco pans & a 90g (Nutz)