Moved into a place which has plumbing for two separate style main pool returns (as well as one for the spa). Understood that I keep the spa turning over to keep it filled and overflowing into the pool, but would appreciate some advice about what the two main pool returns are good for.
The first pool return is a set of 4 eyeballs on the side opposite to the skimmers. The other is 6 smallish (1/2" or less?) orifices on the bottom of the pool.
Just curious if one or the other is better for filtration, or circulation (for heating), or should I just run both at the same time?
Thanks in advance!