If after shocking with chlorine shock and still doesnt register on strips is pool safe to swim in?

Be careful when testing for chlorine. No chlorine will have a clear reading but too much chlorine will cause bleaching of the test reagent confusing you to think you have no chlorine in the pool, try doing a dilution test where you dilute half pool water and half tap water, If coloured results appear with dilution you know you have too much chlorine.

Swimming with too much chlorine can cause skin rashes irritations, discolouring of swim wear rotting the stitches, and blacken jewellry.