Just joined the forum and this is my first post. Anyone every experience a major outbreak of a white precipitate form after using a sequestering agent? The precipitate is sitting on the bottom of the pool and I am running my Dolphin Robot as often as possible to clear it out. In the pool it is a powdery substance that clouds the water when stirred up. In the waste bag of the Dolphin it is a thick consistency like that of wallboard spackle.

some things to note about my pool:
about 38k gallons, gunite, white plaster
SWCG
opened 2006
original fill water was via a truck. Top off from my well, which runs through an industrial grade water softener... i.e. I really do not believe I am adding any iron from my fill.