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.
Only concentrated hydrogen peroxide can be used to shock these pools. A pool should be shock treated at the first signs of algae, after heavy rainfall, after periods of heavy bather usage and at the onset of a loss of water clarity or quality. Another common practice is to shock treat the pool every Sunday evening.