i dont use any in the drip tray. i jsut have it in my overflow box in the tank.
this way i use less, replace less (smalelr piece) and easier to replace. jsut reach in and grab it, rather than having to take the top of the wet dry off to get to it.
i jsut have the top, the drip tray, the empty chamber. then a sponge block to prevent bubbles, the nthe return chamber. that's where my heaters and skimemr are at and my return pump. i also have my skimmer output dumping into the main chamber (same as input from tank)
so any left over skimmer bubbles will get caught up by the sponge.
and, the water gets quad cleaned. goes through poly filter in overflow, then sponge, then skimmer, then sponge again. and back to tank
