Empty the pool out and fill it with soil. OR Use chlorine.
you can use a vacuum or cup
Yes, plaster will dry out and crack.
once you had to empty your swimming pool it might turn into a fu***ing boat ing boat out of it
yes you can
They may survive in an empty pool, but are not able to live under water.
One can get good inground swimming pool by acquiring good inground swimming pool kits. These kits are available online and simple internet search can give you contact details of manufacturer and supplier of good inground swimming pool kits.
A swimming pool is not a storage pool for phosphorus. Not a good idea!
A rusty swimming pool ladder is not so good to see in your swimming pool. I advice you to repaint your rusty pool ladder or you can just buy a new one.