Shock your swimming pool at night that way the sun won’t burn off more chlorine.  Pre-dissolve all shock. The directions may not state that you have to but it’s best to do it anyway.  It spreads easier once dissolved and it won’t sink to the bottom of your pool possibly bleaching your surface.

Always wear gloves when handling pool chemicals and wear old clothes in case of splashing.  Allow your swimming pool to run at least 8 hours straight after adding shock.  Do not swim in your pool after shocking your pool for at least 12 hours.