If you are looking down the shower drain you may be seeing water that is held in a P trap. That is supposed to be there to keep gases from travelling back through the drains. The same plumbing principles apply to a house.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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