Iron in water source

[stcohen]

Attaching 2 pics. One was 1 week after new liner and filter sand, the other is now. Sand was from pool store run by man that installed liner. Saw the bag, said pool filter sand. Not sure I know how to get inside filter. Overcast today with reflections from trees.
Initial brown cleared in about a week. 3 inch rain, appeared to have algae. Shocked and precipitated what I thought was iron. More shock only made it worse. Thought between polyquat and high FC it must be metal. Without softener toilets, clothes etc in house all stain. Do not have softened water at the pool.
http://plus.google.com/photos/110081...KG3lr3WhteKmgE