I had mine up on a hardware cloth-covered tray, but it still got messy. Now I have mine hanging with the waterer even with their shoulder height and I raise it as the litter gets deeper. That does a great job of keeping the water clean for me.
Love, Linn B (aka Smart Red) Gardening zone 5a - 4b in south-est, central-est Wisconsin
Love, Linn B (aka Smart Red) Gardening zone 5a - 4b in south-est, central-est Wisconsin