this is a true return. the return line will come off the pump go up 14 feet then into a double y the two sides of the Y will go to the 3/4 bulkheads in the back of the tank. the center of the Y will go up on top to a manifold with 4 3/4" loclines. the plumbing calculator asks for pipe diameter which will be 1 1/5" going up, but reduce to the 3/4 loclines. if you put in 1 1/2 it comes out 1387
GPH with 3/4 it comes out 440
GPH. I'm a little confused to say the least. I'm trying to not use power heads or at least reduce the amount of them since my pump is so big.
