I am certain there is iron in the pool I just don't know how much. The fence they used for a pool cover was badly oxidized and was over the entire top of the pool. Throw a few galvanized fence staples in there as well.

The algae does not seem to be dying fast enough. I had two days of progress and then everything stopped despite insanely high level of chlorine (14+) as near as I can tell. It does die slowly but I can not vacuum the deep end due to all the debris at the bottom of the pool, and I can't see the debris to remove it. The shallow end is easy enough, although I had to buy an extra long hose to reach the shallow end.

Not worried about the neighbors, the closest one to the pool is about 1/4 mile away.

PH is holding steady at around 7.2. It does not seem to have changed any in the last few days. How do I know I have a correct reading with a high chlorine level?

Wish there was a better way to get rid of the dead algae.