Closing a 35K in-ground, 2 skimmer, 1 main, vinyl liner with historic drainage/liner floating issues in the spring.
Keeping the water level topped to keep liner down. Gizmo in each skimmer.
Controversy is over which of two holes gizmo should sit in while in water all winter.
Suction to filter or dummy hole?
"Gifted's" line of thought, the gizmo should go in the dummy with a real pvc plug and pipe thread to ensure no water gets into suction line when gizmo gets crushed.