If you do need to remove more water you can siphon a garden hose. While this method is not as fast as the pump it gives you another method and keeps you away from the pool store
I understand you concern regarding your liner. I'd be more comfortable running higher CYA/CL levels and letting the CYA level come down with backwashing and partial refills instead of ruining the liner. However if your CYA level is still off the charts it would be beneficial to drain off more water again. This process alone will eventually get your CYA lower granted you don't add any CYA or stabilized tabs to the water.
Let us know what your level is after it is tested again.
Take care.


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