Can a grinder pump be used inside a commercial tenant space and be connected to the interior building drain system. I have a contractor indicating he would take the grinder pump line up into the ceiling and drop it back down in another tenant space and connect to the gravity lines in the slab or trunk. I've never heard of this or seen this before.
I have seen interior grinder pumps used where the sewer line entrance is higher than the basement floor and I have seen exterior grinder pumps used.
I have seen interior grinder pumps used where the sewer line entrance is higher than the basement floor and I have seen exterior grinder pumps used.