I have a blue Pebble Tec pool about 8 years old in Florida. I recently bought a Great White auto pool cleaner and ran it for about 12 hours. I set the vacuum flow to directions. when I looked at the pressure reading it was at 35. Started at 8. Pulled the filter and it was coated with blue plaster. I had to replace the filter. I was told by the pool store I needed to resurface. I stopped using it and have been trying to get the water quality fine tuned by taking the advice of this site. Is my surface too far gone or is there hope I can make it last another couple of years until replacing? The pebbles are not taking toll on our feet yet. But I can tell a difference. Any knowledge on average life span? Do I have a chance if I can keep my water quality within recommended levels?