I came up with the design, loc01 build it for me. I still have another piece on top to block small rock coming out from the reactor. The O-ring for the inner chamber working great so the water will feed from the bottom go through the rock to the top. The water can't go between the two chamber. i will have it clean up and ready for you by saturday, if you want the Eheim compact pump to feed the reactor, let me know so i can hook them up for your with 1/2" hose and 1" return hose to your sump. Cool