We had our inground pool put in about 3 years ago, and a year after having the pool we can see that the liner is wrinkling and discoloring in the deep end around the drain which seems to be from chemicals. Now this year we see that the liner is wrinkling on the wall under the light in the deep end and also in the shallow end, but not discolored. I went to the pool store and told them and they said that if the alkalinity gets to low that would cause it to do that.. My husband is the one that has been taking care of the pool and he said that the alkalinity has never gotten low. We need your help, we don't know what to do about this... Thanks so much... Kim