We are having problems with our pool having a yellowish brown film around certain areas of the pool and puddling dust on the pool floor. We live in Illinois and are around wheat and corn fields and many pine and oaks trees too. At first I thought it was metals in the water because we fill from a well but use a metal sequesterant. I ordered a metal test kit and copper is 0.3 which doesn't seem high. My pool store thought it was pollen and rust from the grass. This makes sense because when walking in the yard my shoes get covered with orange/brown dust.
With this theory we used DE in our sand filter and a skimmer sock and spent alot of time vacuuming and brushing for over a week. It did clear up and in time for a long 4-day weekend with heavy pool usage. Water was crystal clear and no dust or yellow film.
After the heavy usage we shocked the pool. All seemed fine. Alittle green tint but not much. Seems like our white liner has a bit of a brown stain on it so the coloring of the water isn't exact.
After a week we had another weekend of heavy use and then a rain storm of 2-3 inches of rain. We were glad to have this rain for the pool so we didn't have to fill the pool with well water. BUT...now the yellow and brown film is back and the the water clouded up and it's greenish colored and there's dust on the floor again.
Is there a way to tell if this is algae or pollen? And what can I do about it? Do we put in algaecide? Do we shock more? Oh I forgot to mention our phosphate level is high (over 1000).
Current numbers are:
cal har 260
Appreciate any insight...thanks !