I have a24' round Intex Ultra Frame pool with an Intex SWG. We had a bad storm hit us suddenly end of last season and didn't get the pool covered but we did disconnect the filter/pump and SWG. Other than leaves and twigs, the pool stayed clear until February. Last month, in an effort to "shock" the pool, I dumped chlorine and chlorine tablets in the pool. The tablets "dissolved" on the bottom of the pool and now there are hard white stains on the vinyl liner. We tried scrubbing the stains to try to loosen them up and vacuum or dissolve them further with no luck. we don't want to damage the liner. Has anyone heard of this and is there a way to get rid of these spots? It's almost like a crust. Otherwise, we have cleaned the pool, gotten a good chemical balance with the addition of salt, and are ready to open the pool.