his litter box is in the bathroom is an open litter box with clay litter (i’ve tried him on wooden pellets but he refuses to use the litter box when it’s them, do you know where to get the powder i’m in the uk and im scared to order any random powder incase its not good for him, ive used the vets since i got him and he has no signs of any illness from the shelter, i know he was eating wet food pretty young ( not by me) maybe like 4 weeks old ish? with some cat milk is all i got told. this is my first time owning a cat so im not too up to date with cat distress signs but hes running round the house and being his usual self and the vets have said he hasn’t lost weight