First time posting here. Pretty sure I already know the answer to my question but I just wanted to see if anyone has seen/heard what I'm currently experiencing. When I went to open my pool today the water level was down about a foot lower than I had left it in the winter & the skimmer box was full of muddy/cloudy water. I'm guessing I have a crack in the main drain line, but I'm not sure how to tell for sure, or what my options are from here. The pool is In Ground & Vinyl Lined.