Sorry, should have grabbed an image while I was there but didn't. Closed a pool which had an equipment overhaul sometime this spring. This was the suction side setup and I am not sure if this contravenes common plumbing practice.
There are two lines (skimmer and main drain) which feed suction side. Both lines feed into a three way valve. After the three way valve is a tee. One side of tee feeds the pool pump (Hayward Superpump VS700) and rest of circulation system. Other side of tee feeds a Hayward Tristar pump for two deck jets and a waterfall. Does it make sense to have two pumps compete for suction on the same line? I have never seen this in practice before.
And yes it is also stupid when trying to blow out the skimmer and main drain.
There are two lines (skimmer and main drain) which feed suction side. Both lines feed into a three way valve. After the three way valve is a tee. One side of tee feeds the pool pump (Hayward Superpump VS700) and rest of circulation system. Other side of tee feeds a Hayward Tristar pump for two deck jets and a waterfall. Does it make sense to have two pumps compete for suction on the same line? I have never seen this in practice before.
And yes it is also stupid when trying to blow out the skimmer and main drain.