Our cats spend the majority of their time inside, but are slowly becoming outside cats. We still have the trays inside but the litter I'm using isn't hiding the smell very well. I was talking to a friend on the weekend who has an indoor cat and when I asked how he deals with the smell, he said he uses crystals and there is very little smell.

We've always used recycled paper but I've decided to try one that almost looks like sand / tiny wood chips although I'm concerned as it's a 'clumping' litter.

We tried the crystals when we first got the kittens home and they weren't interested at all.

They do spend a bit of time outside now (only when we're home), but don't tend do their business when they're in the yard.

Should I be using a clumping litter?

For those of you have inside / outside cats, do you still have a tray in place?

For those of you with inside cats, which litter do you use / reccommend to mask the smell?