I have raiseable roosts and have been using 2 metal oil change pans with sand and PDZ. The only hold about an inch of sand. Pic and video attached. Even tough it stays pretty dry, and I can easily pull them out to dump and clean, eventually they start to rust. Anyone have a better option for this set up? Pics in replies get bonus points 
View media item 7953518

View media item 7953518