My litter is a newspaper bottom (approx. 6 pages) and enough compressed wood pellets to cover the newspaper entirely.
Wood Stove Pellets are very inexpensive and bunny safe
http://www.rona.ca/en/hardwood-pellets-40-lb-30505000
These are made with 100% hardwood and I emailed the company to ensure there’s no adhesives or accelerants.
The pellets are great because when bunny pees on them they absorb it completely and turn to a chunky material that sinks below the level of the pellets she’s standing on. Therefore no urine scald or wetness to worry about
I swap out litter trays for clean every morning. My Georgie has been peeing out of place a bit and the daily litter change from every other day has improved behaviour.
I’ve read on hrs that sometimes a bunny who simply sits in his litter might need a blanket towel, basket, hideout box or mat bed to hang out on. They said that sometimes the litter box feels safer then other places because of the walls, or simply smells like their territory.