If you do not see your water level going down on above ground pools they use sand for the bottom. My first guess would be that if you have a sand filter that the sand is coming from the filter just a bad or faulty gasket I do not know if you change the sand in your filter or you have someone do it, just have the person vacuum the sand up with the pool vacuum. have someone open the filter up and look at the gasket. A thin coat of sand? Well if is all over the bottom of the pool it is either a fine sediment that the filter cannot pick up or DE. If you have a DE filter and it is DE on the bottom of the pool you either have a problem with the internal components or, if you have a multiport valve, you may have a problem with that. What ever you have the best way to get rid of it is to vacuum it to waste. If you have a multiport valve you should have a setting marked waste and you would vacuum the pool while the valve was in this position. This bypasses the filer and run the water out the backwash line. Any other filter configuration I would have to know what type of configuration you have to advise you on how best to deal with this issue. If this "sand" is all in one spot by the return jet then you probably have a broke lateral at the bottom of the filer. You will need to replace the lateral and if the laterals are over 6 years old replace all of them.
Maybe you just think its your pool and its really the beach. The beach has a lot of sand.
Evaporation
Unfortunately, no. If the sand isn't level when you put the pool on top of it, the bottom of the pool will stay uneven after it's filled. Sorry.
One reason that causes sand to accumulate at the bottom of your pool is a sand filter with a broken lateral or laterals. Notice where the sand is accumulating? Is their return outlets from the filter directly above the small piles of sand in your pool? That is a broken lateral. You can fix this problem by scooping out the sand in the filter and replacing the laterals at the bottom of the tank. I have been cleaning and repairing pools for a long time and it is my suggestion that you hire a professional for this job.
One of the lateral returns inside of your sand filter may have snapped. When that happens, it can send sand out of your returns. Have your local pool place repair your sand filter.
no, it probably just means someone went in the pool with dirty feet.
first of all there shouldn't be a lot of sand at the bottom of your pool. assuming you don't live on the ocean where sand could become air born the only thing that makes sense to me is that something went wrong when you backwashed your filter. to get rid of the sand vacuum the pool every day until it disappears
If you are getting sand coming into the pool and have a sand filter you may have to replace worn laterals in the sand filter.
Dead algae.
It is best to use a fairly clean sand, like washed river sand shy away from a loamy sand as used by bricklayers.
There should be a drain plug near the bottom of the filter. Open it and let drain. The sand will stay in.
You should be able to just vacuum it out with the hand vacuum . If it is an enormous amount of sand using a venturi system like that used for emptying sand filters may be a good idea, You could run the water and sand into a drum and let the drum overflow back into the pool leaving the sand on the bottom of the drum.
Can you remove the bottom drain shut off valve and still blow out a plug the bottom drain on your pool.
It already is used as pool sand!