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When using a filter, I prefer to NOT use a chemical. Instead I use coloidal silver. Silver has been used for generations to kill bacteria including Giardia and Crypto. I understand it kills on contact and wait times are reduced as well as being unaffected as much by temp. I have a link somewhere to NASAs use of silver in the space program.
I have sampled water from a pool of water containing crypto. I gave it to a lab tech in the water business to confirm this. We added five drops of CS 500 ppm to 8oz container and the crypto was dead in 2 min (room temp). We did not retest on larger quantities though.
Although there was Crypto in the water, I want to explain that it was NOT abundant!
It was estimated that there was a VERY small concentration in the gallon we collected. However, since it only take one protozoa to cause problems.....


I call BS on this one.

Peace,

Richard.