I have an Inground Vinyl liner pool that has, what appears to be dry rot just above the water line in one corner. When I talked to the liner installer/pool store, He said that high alkalinity will cause this. I know my fill water is high alkalinity, so I was wondering if he is right. I have no scaling or anything, so I haven't been to proactive to keep it down. The liner is about 5 years old, and will have to be replaced this year or next spring at the latest. I don't want to be doing something that will continue to degrade my liner so fast. It seems I can only get 3-5
years out of a liner. When I replace this liner it will be the 4th liner since pool was built in Spring 2000.