Last year, we closed our above ground pool successfully by blowing out the main drain with a 6.5 HP shop vac. This year it is not working, and it is causing us some stress.
Right now, I have the pool drained 6" below the return, and the pump and hoses are disconnected. We wanted to blow out the main drain, seeing it bubble, shut the main drain valve, and then cover the pool for the winter. Because we cannot blow out the main drain, the pool water is sitting there, and the FC level is now below shock level.
I have an air compressor, but I am not sure if I can use that to blow out the main drain. It is a 150 psi, 15 gallon compressor. Would that work, or would it damage the line?
What are the best steps to follow, to ensure I can keep the pool clean and up to shock level? I could connect the pump again and just use the main drain to circulate water. I could also just cover the pool for now, and uncover it partially later to see the main drain, as it bubbles when we blow the water out.
I would appreciate your thoughts and help on this.