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.
Some suggest that a weekly pool shocking should be performed. But such a general timetable would be hard to apply to all pools, in all situations. Referring again to our A-B-C's of pool shocking, there can be only 3 reasons to shock the pool. You either have Algae, Bacteria or Chloramines (and sometimes cloudy water). If you don't see any algae, and your tests for bacteria and chloramines are not concerning, then you can keep the pool shock on the shelf.