Thanks JR, I'd have to put a "T" in my overflow drain then, put a ball valve inline to control the flow into the skimmer, and have the rest of the water flow into the sump bypassing the skimmer. Should work. My only hang-up is the cost...I can get an ASM G6 used for $400, the Reeflo is $1000 used.....is is really worth double the money? Or will an ASM, do a decent job for a medium bioload......