Went by the pool store for a free test (I have a full set at home, but like to see what they come up with).
I was informed that my calcium hardness was very low, at 50. (It has traditionally always been 60 to 80.)
I told him a calcium hardness in a vinly pool is inconsequential, and they said it affects the vinyl liner. That a vinyl liner should last 10 to 15 years, but with low calcium hardness it will only last 5 years.
Anyone heard of this?