You're on the right track. The liner will go back when you remove the ground water. Getting it out with a hose may or may not be a troublesome job.
If your are looking for a permanent fix, many folks sink (from the surface to below the pool floor) an 8 or 10 inch pvc pipe as close to the pool as possible. this allows them to drop a submersible pump into the pipe and keep the ground water away from your pool.
If you decide on this, be sure to drill holes in the pipe and cover them with landscape fabric that allows the water through but not the dirt.
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