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It could damage the internal PVC of the filter and cause sand to get in your pool.
You can get swimming pool filter sand or a number of other filter media that can be used instead of sand from most pool shops. You can also get sand from under above ground pools from a builders supply or nursery.
Sand is normally put under the pool liner to create a smoother surface.
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.
YES
Its not a good idea to put a plastic liner under the pool. It retains moisture and rots the walls and the rail the wall is in. Your pool will not last. If you follow manufactures instructions, sand under pool and a good drainage system around the pool will make the pool last 25 years or more. Whenever water sits against the pool walls its going to eventually rot the wall and can seep under pool causing the sand to shift and then the liner will go bad.Its all sales hype about the coving and gorilla stuff...its not needed.
Washed float sand.
There wont be any dirt under the sand. When you vacuum your pool you should do it on filter mode Otherwise you will lose a lot of water for nothing, this would be especially wasteful in the case of a salt water pool. Ofter having vacuumed the pool on filter mode and if the pressure gets too high backwash. after backwash rinse for a minute, then return to filter.
That'll depend on the size of the pool.
The sand filter head is not assembled correctly. There is a basket-looking piece that seems to belong to the tank, but it really should be attached to the multi-vavle head. Instead of being forced through the sand, the water is hitting the top of the sand pile and returning to the pool from there, instead of that return pipe that comes up from the bottom of the sand pile.
It already is used as pool sand!
Gravel mulch costs way down on soil and sand splash. It is a way to stop and prevent erosion of all kinds of different soils.