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my older cat 17, has started to wee in the litter tray after years of exclusively going outside. He produces gallons of wee (he has been checked by the vet and is ok) The litter is sodden and stinks after a couple of days though. I have preferred a crystal type for years for the other two as it didn't smell, lasts ages and it dehydrates poo fast until it's scooped. So is there a better kind that will last for longer and not be too horrendous to change?