An unusual leak detection. The pool only leaked when the variable speed pump ran on hi speed. The pressure test of the returns only revealed a 3 lb drop in 30 seconds when the pressure was brought above 20lbs which is very unusual. Here’s what happened: the child fence installer hit the line and instead of doing the right thing, he packed the grommet base with plastic and packed it in to prevent the homeowner from noticing. Watch the gusher after we removed the grommet and plastic packing.