This is the third year with our AG 17K gallon pool. Had to drain and refill this year due to pump problems. Installed new pump and filter.

We have a rust problem with our water, although it is not well water. Added Rust and Scale chemicals from pool store and water was sparkling clear blue.

Vacuumed the pool and proceeded to bring chlorine level to shock level with bleach. Next morning, after small rain storm, water turned bright blue to light purple. Numbers from test kit all are in line.

Any thoughts on what this may be or what should I do at this point?

Thanks to all.