Hello. For some reason my pool lost almost all of it's water during the winter months. There was 1/4 of water left in the pool. I don't think there is a hole in the liner so why would the water be so low? Also, the bottom of the liner is very dirty so I am now empting the rest of the water and the I have to clean the liner. What is the best cleaning solution to use to clean a liner? Thanks for your help.