Fine dust on floor of pool

[kaffy]

Please help. My husband bought this pool, but never cleans it. I have tried my best, but cannot seem to rectify the problem. There is a very fine brown sand like dust at the bottom of the pool. If I brush it with the pool brush it seems to disperse, but reappears the next day. I have vacuumed it and done a back wash, but it reappears. I thought it might be algae so I have treated with algicide. Still returns. Any suggestions would be greatly appreciated.

[Buggsw]

Could be yellow algae, could be dirt.

To treat for algae shock your pool higher than normal and keep it high for 2 or 3 days.

What are your test readings? What type of pool and what is the pool volume?

Algaecide is better for prevention than killing.

[Guest]

Thanks, I will give that a try. The pool is and in the ground fibreglass one. With an Astral pump. It is 8.75m long, 4.75m wide and the depth graduates from 1.30-1.90. Re the readings, the chlorine is a touch lower than should be, but I still get this problem even when the chlorine is high. I also have a problem keeping the ph down, which I know can lower the effects of the chlorine. I did wonder if it was really fine dirt just passing through the filter system. Is there anything you can do that.