Finding a hole in liner

[Joe44]

Could it be mustard algae? Sometimes it appears to look like sand. If you can get some and put it between you fingers and rub, see if it is gritty or a bit slimy.

I think It may be mustard algae. I just tries to get it between my fingers and it dessolves. What should I do to get rid of this. Thanks , everyone for all your help. Joe

[Kinguni]

I thought the same thing with my pool running earlier this year. That it's settled on the bottom of the pool and the pool is clear means I don't worry about it and just vacuum it up once or twice a week. It's worse after windy weather so in my case it's just dirt settled in spots. It does look like sand though.