dirt or algea?

[hearts2swim]

Thank you. I have vacuumed this "dust", however by the next day or even hours later...its back. Changed the filter..does nothing. Not sure how to tell if i have a sand filter? Its just an intex 22x54 pool. the filter came with it, its just a tiny ole thing, if it would have been filled with sand, it would have to be empty of it now! I have tried everything, took water sample to pool store..waste of time. I was told to just shock the pool for about 3 days straight. I was told "we didn't test for algae." despite the fact thats what i told them i thought i had! I have been shocking, back washing, vacuuming. Ive used borax, chlorine, shock packets from walmart. i know i have low ph. Pool store told me to leave it low, because high ph makes algae worse. And now there's these little swimming bugs/tadpoles (??) in the pool!

[PoolDoc]

Is this what you purchased? Intex 22' x 52" Ultra Frame Swimming Pool

Is this the pump you have? Intex 56633EG 2500-Gallon Filter Pump AC 110 to 120-Volt