Cat litter changing water values
I have started a tank with Cat Litter as substrate that is safe to use, but the cat litter is changing my water parameters in i way i did not expect.
My water measurments is:
PH - 8
GH - 7
KH - 1,6
First i thought that the cat litter was stripping KH out of the water, but i did just test my tap water, and my tap water KH = 1,6 and the GH = 4
That means that the cat litter actually is raising the PH and GH, my tap water GH is 4,0 . I have not measured my tap water PH, but i now it is lower than 8.
Is it normal that cat litter or other similar substrates raising PH and KH, or is it something wrong with my cat litter?
I started doing water changes to make the KH higher, but if the at litter is raising the PH and KH water changes is not probably going to help.
Need some suggestions/help