Sanitizer for indoor pool in the Olympics?

They are using a combination of chlorine, UV, continuous floc in the sand filters, and extreme circulation. One of the more entertaining features is the use of variable speed pumps that automatically change speed as the bather load varies, so that filtration always remains at optimal levels relative to the bather load. Another green feature is the use of the backwash water to flush the facility toilets. They claim that they are getting one micron filtration by using floc combined with 1 meter deep sand beds with specially graded sand.
 
Hurricane Gio said:
I always heard that you could not use chlorine indoors due to vapors during evaporation. I guess another myth?
Almost all indoor pools use chlorine. Air quality issues are a common problem with indoor pools. Chlorine it's self is not the problem. However, several chlorine disinfection byproducts (CC) tend to get into the air and can create serious issues if the levels are not properly managed. Outdoor pools don't have these issues both because sunlight dramatically reduces the levels of those byproducts created in the first place and because they tend to just blow away.
 
WikiAnswers says that an Olympic-sized pool holds around 650,000 gallons. PoolCalculator.com calculates that you would need 125 128 oz (US Gallon) jugs of Ultra bleach (6%) to bring such a pool to the 10 percent CL level that was used in Atlanta!
 

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