Chlorine concentration at 500 ppm hazards to health to wash dishes in
The permissible exposure limit of OSHA is 1 ppm.
Toxic residues from the chlorine may remain
The recommended chlorine level for disinfecting private pools can be as high as 2.0 PPM. 2 ppm is now the minimum. Recommended levels are now 1.5 ppm to 5.0 ppm.
PPM or parts per million
Residential pools: 1.0 - 3.0 ppm; Commercial pools: 3.0 ppm - 5.0 ppm; Bromine levels: 4.0 - 6.0 ppm
You only need to shock the pool if there is visible algae, or if the ppm of total chlorine is higher than the ppm of free chlorine. Generally, a level of 2-4 ppm chlorine is all you need to keep your pool sanitary. Let the level drop to that on its own, or use sodium thiosulfate to drop it quickly if you notice itchy skin from excessive chlorine.
500 ppm.
Use muriatic acid.
One Tablespoon of chlorine bleach per gallon of water will give you 200 parts per million PPM. Health Department requires 50 PPM.
Chlorine levels should be between 1-5 ppm
Someone/something changed the original question and that is probably why it has not been answered.Safe levels for chlorine are 1.5 ppm to about 5.0 ppm. of free chlorine. You should have a test kit that will give you free chlorine readings as opposed to just a chlorine residual. Free chlorine is what sanitizes the pool water. If you can smell a chlorine odor coming from your pool then you do not have enough chlorine in the water.K