Also, I just went back out and checked and there are only a few spots that have formed again. I checked my filter just out of curiosity....it looked like someone had dipped it in tea about 3 quarters of the way up. I took the hose and washed it out well. Looked just like strong tea pouring out of it. There was barely any visual signs of where it had been once I rinsed it well. I stirred those few spots back up and hopefully the filter will pick it back up.