I'm assuming you are using a sand filter. First, is the pump and filter hooked up corretly? Pumping the water through the filter the wrong way will blow sand into your pool. Is the control valve in the correct position? If it's in between positions it might let some sand into the pool. Is the control valve cracked or broken? Self explanitory.
If you are getting sand blowing into the pool through the returns You have a problem with the radials in the sand filter. this will require removing the multiport system from the top of the unit . removing the sand, and replacing the worn radials. Get advice from your pool shop.
It already is used as pool sand!
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.
it recirculates the water that is pumped back into the pool without allowing it to go through the filter
If you have a sand filter the laterals in it may be starting to show signs of wear these wil blow sand from the sand filter into the pool when they wear out.
No they aren't
The amount of sand in a pool filtration system depends on its size.
SAnd is used in sand filters. rocks are not used in pool filters.
No, sharp sand and pool filter sand are not the same. Sharp sand, also known as concrete sand, has larger, angular particles and is often used in construction and landscaping. Pool filter sand, on the other hand, is specifically graded silica sand designed for use in swimming pool filtration systems, providing effective filtration due to its uniform particle size and smooth texture. Using the wrong type can affect pool water clarity and filtration efficiency.
To determine how much sand is needed for a 10,000-gallon pool, it depends on the type of pool and the depth of the sand layer desired. For a standard sand filter, you typically need about 1 pound of sand for every gallon of water, translating to roughly 10,000 pounds or about 5 tons of sand. However, if you're referring to a sand base for an above-ground pool, you'll need about 2-3 inches of sand, which would require around 1-2 tons of sand, depending on the pool's dimensions.
The sand filter wont make a pool green this happens a s a result of algae.
It could damage the internal PVC of the filter and cause sand to get in your pool.