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.
The pool jets may not be working properly due to clogging, airlock, or a malfunction in the pump or filter system.
What is your question
Assuming you mean it's a circular pool (a cylinder), then the area of the bottom face of the pool would be (pi*92), which comes to 81pi or about 254.469 feet2.
10 manisons!
pool whips are flexible hoses that move around the bottom of the pool to move dirt and alea towards the filter. They move from the force of the water spraying out of them.
Humm, My pool does not get that way as you state in your question.
Check the grid and manifolds for holes or cracks.
At the bottom of the pool.
The distance from the bottom of the pool to the bottom of the house footing is based on a 45 degree line from the bottom of pool to the bottom of the house footing. Basically if the pool is 3'-0" deep you must stay 3'-0" from the house. If the pool is 6'-0" deep you must stay 6'-0" back. Call your building department to verify.
Insalall thick carpet.
depending on how large your hot tub is, you can just use a pool shark. they plug into the wall, and move around the bottom of the pool, or hot tub if you like. they are really neat, they are basically underwater vacuums.
There is no filter at the bottom of a pool. Perhaps you are looking at the hydrostatic valve which is there in case your pool is emptied and Will make sure that the pool wont float in ground water.