My in-ground 24,000 gallon pool is 51 years old and it has never never been re-plastered and leaks only about 15 gallons per day. Over the years the cement had dissolved exposing sharp sand grains that hurt the grand kids feet. Sp 3 years ago I "polished" the white plaster with #50 grit diamond concrete polishing pads. A lot of white slurry was created during the grinding process which I vacuumed/shoveled out.
The I started pool back up and it worked great. Only thing I noticed is I have 3 small rust spots where rebar leaches through. Last year I replaced my sand filter with a cartridge filter. I use a Kreepy Krawly and when I clean the cartridge I am getting a small amount of white cement. It is the white cement "dust" that plugs the cartridge after 2-5 days. I keep the Ph about 7.0 to 7.2.
Does anyone have idea on how to cut down on cement leaching?