Hydrostatic pressure release. I have a concrete pool that is 50 – 60 years old. It is 20 ft x 40 ft x 10 ft deep. I live in New Orleans. We are known for fairly high water tables. The pool needs replastering. I was going to do it with Sider Oxydro’s Sider Proof FF-PR paint on, trowel over plaster resin product. I have only drained the pool once while we have lived here. Start to finish it was two days. Drained, pressure washed, filled. I am concerned about popping or floating the pool. I figure it will be empty about 5 – 7 days to get it cleaned, plastered, dry to fill. The pool piping is copper. I don’t know, but doubt there is a hydrostatic plug in the bottom drain. I have been told I either need to bust a big hole in the bottom, drill 6 – 8 .5 inch holes in the bottom, or bust a hole and put in a hydrostatic drain fitting.
Do I need to do this? If I bust a hole, or drill holes, when to I patch them and with what? It seems to me I need to patch and then plaster them, so they would still be closed off for 3 -4 days.
How should one do this? Is there a drain fitting I can install to hook a pump directly too? If so how? What type of pump etc?
Any input is greatly appreciated.