why do you need both? They ...

Published July 11, 2019 15:27 by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health

why do you need both? They both work well. I assume you are not treating drinking water and must have very high chlorine concentrations.. I would add the bisulfite, or even cheaper sulfur dioxide, The GAC will eventually lose its reduction capacity, so use the chemical.

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Hi, Joseph,
The end user's consultant need to use both.
Residual chlorine will be less than 0.5 ppm.
will be used to feed an RO unit, drinking water application.
Thanks

Published July 12, 2019 01:29 by Osama Hamad, Director at MDC Water

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They should recheck their consultant. Who is it? For 0.5 chlorine either would be fine. But actually the better choice might be to add ammonia and make chloramine which will help to control biofilms on the RO membrane.

Published July 12, 2019 15:42 by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health

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