I'm using a LG 4MDQX-SC. I use it for my return, I just used a 't' off the return. But If I was to buy another pump, I'd get a mag9.5 and use a valve to adjust. Most people use a mag 7 for the spray injectors of this size. The injector you just make yourself from 3/4" or 1/2" PVC. I'm going to try 1/2 injector. I remember reading about it on RC and it is supposed to make a big difference.
Walter
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