The "bunny beans" build up on the ground. You can shovel it out every few months. It is great fertilizer. You may be able to get a gardner to clean it out for just so they can have it. Since my rabbits are in the back yard the smell is negligible. This could be the case because the cages are over soft dirt and the urine passes through. If they were over cement it may be a very different case.
josh

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