So browsing through YouTube and I came across a video and gave it a try.
Basically you use a sifting litter tray in reverse so instead of using a clumping litter which makes the small clean grains fall through and get used again. You use a wood chip litter and throw away the dust that falls through.
I've used wood chip litter before and soon as there's a wee the wet bit turns to sawdust so I'd have to change the whole tray fairly frequently when it became too dusty.
This way the litter lasts way longer and smells decent too as I only have to sift and top up so wastes a lot less.
I've tried all sorts of litters but this ones a game changer!
Also you only really need one sifting tray as you can use the sifter bit for multiple litter trays, just need to make sure the litter is large enough to stay above the sifter.