There really is no "best". The key is to keep your water as perfectly balanced as possible to avoid needing an acid wash to clean the plaster. An acid wash actually takes off a small layer of the plaster. Also note that products such as Pebbletec are a bit rough on the feet, although it is beautiful.
concrete
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.
The best and fastest way I have found is using my Shop Vac. Hope this helps.R.B.
Turn the pool upside-down and knock on the bottom.
The pool will leak into the ground if a hole is eaten on the bottom.
The wrinkles are there to provide for liner shrinkage over the years.
Duck tape
You have no choice but to replace the liner
From the information I have found the best thing to do here is go with a vynil pool as these are best suited to ground movement
is there a hydrostatic valve in the bottom? These are designed to let ground water into the pool to avert the pool starting to float it way out of the ground. Once that hapens you are in big trouble.
Buy a pool patch
no