The suction side cleaner - pool vac - may have air entrapped inside the housing. Inverting it while still under water may work.
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.
No it wil float to the top of the water.
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.
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0 it dies to pool water chemicals
it is less dense that the water so it is boyuant and will go up to the surface
No. The color won't stay and the chemicals in the pool will react to it.
Yes, I've done it several times over three summers. Of course it's not a good idea to leave it empty for very long (since the pressure of the water in the pool helps the pool stay in the ground) but sometimes it is necessary to completely empty it, say for removing a large spill of decomposing leaves, cleaning the bottom, or repainting the pool.
Swim in the local pool or in oceans.
Cement!
There should be a drain plug near the bottom of the filter. Open it and let drain. The sand will stay in.
The pool should stay empty for as short a time as possible. When the pool is empty the walls are subject to relativley extreme changes in temperature, compared with the stable temperatures of water. Shrinking and expanding (with temperature changes) of the pool wall surface will result in cracking. You then face the joys and expense of repairing the cracks. The bottom line is: Empty the pool only when you need to, do whatever you intended to do while the pool is empty - and start refilling it immediately. Just wanted to add that a pool left empty can "float"..that is to say it pops out of the ground, rising above ground level several inches or more. The ground surrounding the pool, especially if it is wet, is heavier than the pool surface, and puts pressure on the pool walls, which could cause tehm to crack, or "float" the pool. Having said that, I had my pool empty for a long time before I had it re-plastered and nothing happened to it. :)