Maybe you meant to raise the water level of your pool, but forgot to turn the hose off, and now your pool is overflowing. Maybe your area experienced heavy rains, raising the water level too high. The water level in a swimming pool should be halfway up the opening of the skimmer. If it is much above this, floating debris cannot enter the skimmer, and your pool may become contaminated. Removing excess water from your pool will allow the skimmer to function properly, and help keep your pool clean.
Turn off the pool pump.
Hook a garden or other flexible hose to the waste outlet on your pool filter. Direct the hose so that the excess water will be flowing out to the gutter, or other drainage area.
Set your pool pump to the waste setting.
Set the pump to the "on" position, and allow it to run until the water level is at halfway up the skimmer opening.
Stop the pump, remove the hose and reset the pump to the filter setting. Turn the pump back on.