Ive had a re-curring what I thought was Algae problem in an indoor hopper design pool, with what looks like algae sitting on the joins, corners and slope edges of the pool floor. I have superchlorinated upto 15ppm, brushed and hoovered, then extended backwashed and flocculate with goldifloc after every backwash
NOP Test Results:
Scotland, soft water calcium hypochlorite for all disinfection, the more I read on line the more it sounds like I have a pollen problem, Once I have cleaned, superchlorinated, hoovered and backwashed the lying debris returns within a few days. The pool holds 180,000L / 25,000 gallons and is filtered for 4 hours per day, I know this aint much but thats me got the owner up from 1 hour a day!
It is possible that pollen is entering via the seperate air conditioning units but I am really unsure as I have never experienced this before nor worked with a pool that doesnt have a plant room running 24/7