perlite doesn't clump like vermiculite. i mix my egg boxes with perlite. i don't really do a ratio. i mix water in until everything is damp but not soggy or standing water. i only put four little holes in it one on each side and keep an eye on the condensation on the lid. and check the egg's surface' alot. i'll get pics up soon. you can get perlite from any home/garden shop like southern states.


vaughn