In pursuit of water that doesn't foam anymore, I elected to drain and refill my spa. During the process of refilling, the local water authority decided to flush the lines to remove build-up of something or other (no idea what). When I checked to see how close to full the spa was, what I saw looked as though the Mississippi had been used to fill the spa - it was horribly stained with boatloads (or tub-loads!) of manganese. I can't tell if I should drain it all out and refill again, or simply run the jets for an hour or so. Because of impending dark and very cold temps, I had to leave the water in the tub overnight. It is now mostly clear, but I am a bit concerned that my brand new filters just got ruined. Anyone have any advice about this? I'd love to get this resolved.