Hello everyone, I'm in the middle of re-piping my return line for my inground pool, (leak NOT located). I was thinking of adding a Tee and shut off valve coming off the Tee in the line by the equipment pad. This Tee would allow me to vacuum any residual water left in the line after pool closing. Would a vacuum be able to suck any remaining water in the line ?? Is this even worth it ??? Thoughts, doubts ?? Thank you.