I got the DE and added one cup mixed with pool water into a skimmer. There was not a visible result from any of the returns.

The FC is at 5 according to the OTO kit.

The k2006 kit is scheduled to arrive on Monday.

Today the pool has a very fine film of rust colored dust around the returns (maybe 3-4 feet around). Otherwise, the pool floor is starting to accumulate the powdery looking algae. It always starts accumulating wherever there are wrinkles in the liner or at the angles where the inclines meet.