What do you use for chlorination? Tablets in a Hayward Chlorinator and chlorine shock.
Is the sand-like residue hard, like scales, or like clumps of dirt, slimy, etc? Greenish brown stain.
Does the brown form just on the bottom of the pool, or also on the sides? On bottom and sides including stairs.
Does it brush away easily?It brushes away easily.
What is the source of your fill water? Fill water is well.
Any metals in the water? Not sure if any metals in water.
We have been adding a lot of water to the pool. Not sure if we have some kind of leak. Yet another issue.