Okay here goes. We had to replace our liner this year. We are on stage 5 water restrictions. No new pool filling. We have a pond on our property and my husband, decided to completely fill our pool with water from our pond. He pumped it in, pour a bunch of algaecide into the pool and handed it over to me. I found your site, bought a Tf-100 test kit, slammed it, added DE to the sand filter and it started clearing from dark brown to a lighter shade of brown. Last night he added clear water from a rain barrel and I woke up this morning and the water is the color of dark brown rust. Help!!!!