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.
Chlorine tablets/shock and the salt water chlorine generators are both very effective ways to sanitize your swimming pool. When using the salt system you can eliminate buying and storing the pool shock so it is one less chemical you have to worry about. There are different forms of chlorine and chlorine tablets.