You may not even need to build a manifold. I just put a small pump like the cobalt 1200 in the sump for each reactor. I ended up plumbing the UV filter on the return though. If you take that route you will need a beefy pump since the UV slows the flow quite a bit. I have my return at 400 gph which is fine. I have the 1” flow sensor too, which helps in the beginning.
I ended up placing an order at
Bulk Reef Supply for the 1” flow sensor, a 1.25”-to-1” reducer, and a 1”-0.75” reducer. I am going to use the 1.25” union that came with my COR-15, so I will grab a small piece of 1.25” PVC to attach the 1.25”-to-1” reducer to. Then, I’ll attach the flow sensor to that. I’ll add two 45° fittings on top of the flow sensor, and then reduce that to 3/4” before it enters the tank.
I decided that I want to get the system up and running, and this will let that happen. Then, I can order another COR-15 next month, and I’ll plumb a manifold off of that to run the UV sterilizer and algae reactor. It’s more than I want to spend, but it will allow me to have more control over the system, and I can maintenance the manifold without having to turn off the return pump. Also, it will give me a second COR-15 that I can use as a backup if the main return pump fails.
I’ve been taking notes, and there is a lot that I want to do differently on a future system, but this has given me plumbing experience that I didn’t have. The conversion from metric to U.S. standard plumbing, and the dimensions of the stand, tank, and sump haven’t left me with much room to run the equipment that I want to off of the return. I think that my solution will be best in the long-term because I will have more independent control.