The 1. Overflow box with sponge media removed creates a vortex drawing air in creating micro bubbles that exit into my 6. Sump. By using this process that happens naturals in my tank I will try to improve the contact time of the bubbles by making several 2. Counter clockwise turns in the return pipe coming from my 1. Overflow box to the bottom of my 6. Sump. Switching directions of the pipe to go back up to the 7. Water level in my sump I will place a 4. Y in the pipe at the 7. Water linepointing downward. The upward portion of the 4. Y will contain a 3. Collection cup above the 7. water line. The side portion of the 4. Y will have a 5. Ball valve on it to control the heigth of bubbles to the 3. Collection cup. It will then turn up to drain into the 6. Sump. The 4. Y at the water line pointing down allows the bubbles to only go up to the 3. Collection cup and alow the water to exit to the 6. Sump.

keep us updated maybe if you slid a air stone Dow to the first curve it would help with bubble production

