What are the time frames for effective treatment of surface waters?

After combining Parts A and B and waiting 5 minutes for activation, the solution should be added directly to the water being treated and wait for 15 minutes to kill giardia, bacteria and viruses. An additional 3 hours and 45 minutes are required to kill cryptosporidium.  After the initial 15 minutes of treatment, carbon block filtration would remove the cryptosporidium and improve the taste of the water.

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