I found out a few things about this having just done it....You can tee the line to add the second suction but the closest one to the filter will have the most pull. Initially I put in one ball valve to close the skimmer, but I realized i needed one on each suction, the skimmer and the vac suction. I also put unions downstream so I could disassemble the sections to replace the valves...i also put my suction line about 18" down from the water line so I could hook up the vac without being in the pool....a good idea since my kids can also reach it and I can delegate that small task.
Best of Luck
I was talked out of a balancing type valve...but you definitely need a domed safety insert for the suction so nobody gets stuck to it when its not in use. I hope I helped...i am a pretty good plumber but new to pools.
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