The wing would have been a severe obstruction to apprehension of an object on the ground. ( 1 law) The act of seizing or taking by legal process; arrest. 2  1855, Elizabeth Gaskell, North and South, ch.  The warrant had been issued for his apprehension on the charge of rioting. The act of grasping with the intellect; the contemplation of things, without affirming, denying, or passing any judgment; intellection; perception.
Shocking your pool at the correct time can make a big difference to your pool. If you shock your swimming pool mid day in the middle of the direct sun the swimming pool shock will burn out of the pool faster. The best time to shock the swimming pool is after the sun goes down. Shocking the pool after the direct sunlight has passed over the pool is the best time to shock your pool.
Shock is liquid or granular chlorine. You should add one gallon (or one pound) of shock per 10,000 gallons of pool water every week to two weeks. During hot weather or frequent use, you may need to shock more frequently. Low chlorine levels often cause green or hazy water, so if your water looks a little cloudy and you haven't shocked in a while, adding shock is the first step. It is always best to shock the pool in the evening, when the sun if off the water.