I get clay here.
http://www.clayworld.com/redart-clay/
Here's some more good info on clay. http://www.aquaticplantcentral.com/forumapc/substrates/82956-info-red-clay-mineralized-substrates.html
Sorry, can't help with the kitty litter.
http://www.clayworld.com/redart-clay/
Here's some more good info on clay. http://www.aquaticplantcentral.com/forumapc/substrates/82956-info-red-clay-mineralized-substrates.html
Sorry, can't help with the kitty litter.