Ground Water Behind Pool Water
If your pool liner for in ground pool is floating up off the bottom of the pool you are most likely experiencing the effects of ground water behind pool liner. Underground streams, lakes and rivers exist even during drought conditions. Additionally, heavy rainfall can cause a temporary rise in ground water levels which will cause pool liner floating.
If your pool liner has water behind it you only have two choices.
1. Remove the ground water from behind the pool liner yourself.
2. Allow the ground water to lower naturally.
How to Remove Ground Water from Behind a Pool Liner
Removing ground water from behind your pool liner is not an easy process. For most people it will be necessary to hire a professional pool company to provide this service for you. However, if you insist on doing the work yourself you will first need to empty the pool completely using a sump pump. Once all of the water above the pool liner is removed you can place the sump pump behind the pool liner to remove all of the ground water from behind the liner. Keep in mind that this may take quite a while. In some cases the ground water that you are seeing inside your pool basin is representative of much more water in the earth around your pool. If this is the case you will notice water coming in from the ground (usually at the deep end of the pool) after the bulk of the water has been removed by the pump. Continue pumping water until the incoming ground water has stopped or is coming in slowly enough to reset the liner without any problems.
After you have removed all of the water both above and below the liner you can now reset your pool liner in the traditional process.
Allow the Ground Water to Lower Naturally
The ground water under your pool liner may or may not lower naturally over time. If your ground water issue occurred as a result of heavy rainfall then the chances are very good that the ground water will lower on its own within a week after the rain has stopped. If your ground water issue occurred with no obvious causes it may take much longer for the ground water to dissipate back into the earth. There is also a small chance that the ground water will never go away. In this case you would need to install a sump drain within 10 feet of the swimming pool to control the ground water.
If you would like more information about ground water or resetting a pool liner feel free to contact me, Chris Ward, via www.lazydaypools.com.