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.
So here are the parameters for shocking your pool. If your water temperatures are below 50 Fahrenheit you should shock the pool once every 4 weeks. If your water temperatures are 50-69 you should shock the pool every 2 weeks. If your water temperatures are 70 you should shock your pool every week. Shock your pool if you have had a heavy rainstorm where you have to drain water out of the pool. A storm like this will drop algae, food for algae and other contaminates into the pool water.