I used to throw pine shavings in the trays but found that they clump around the poop and actually keep it wet longer. I clean the trays on a daily basis because I like to keep my coop very dry - dry is good, especially when you have temps that go negative.Makes sense and uses less consumables. I feel like the litter helps keep the humidity levels down which is the main reason I use it. I never tested with and without though...