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What is max chlorine for safe consumption and swimming
3

What is max chlorine for safe consumption and swimming

What is max chlorine for safe consumption and swimming

(OP)
How much chlorine can be added to drinking water and still be deamed safe??

How much chlorine can be added to pool water and still be deamed safe for swimming??

RE: What is max chlorine for safe consumption and swimming

The maximum that can be added is however much it takes to satisfy the "Chlorine Demand" of the water.  I think what you are referring to is "What is the maximum Free Chlorine residual of drinking water and still be deemed safe?".  All that is needed is to have a Free Chlorine residual of 0.2 to 0.5 ppm.  Beyond that the water will have an objectionable taste and odor.

For swimming pools the Free Chlorine residual should be 1 - 4 ppm.  Above 4 ppm could be harmful.

Gary Schreiber, CWS VI
The Purolite Co.

RE: What is max chlorine for safe consumption and swimming

Drinking water:
EPA has set a maximum contaminate level for free chlorine at 4 mg/l as residual, from the disinfection byproducts rule.
The sodium hypo chlorite brand that I use has a maximum dose rate of 84 mg/l as part of its NSF 60 listing.  It is 12.5% so this results in a dose rate of 10.5 mg/l.  
Hydrae

RE: What is max chlorine for safe consumption and swimming

I found some information on the same sobject:
NATIONAL SPA AND POOL INSTITUTE
Suggested Chemical Standards for Swimming Pools
Free chlorine, ppm          1.0 - 4.0
Combined chlorine, ppm         None
pH         7.2 - 7.8 (ideal range of 7.4 - 7.6)
Total alkalinity, ppm    (for liquid chlorine, cal hypo, lithium hypo)  80 - 100
 
(for gas chlorine, dichlor, trichlor and bromine compounds)
 100 - 120
 
Total dissolved solids, ppm->Not to exceed 1500 greater than at pool start-up
Calcium hardness, ppm         200 - 400
Cyanuric acid, ppm         30 - 50

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