Those using chemicals alone should use chlorine dioxide like Micropur to treat all 3 types of baddies: viruses, bacteria and protozoa/cysts.

OTOH, those who pair chemicals with a filter (e.g. Frontier Pro) should just use bleach to kill the first two types -- and rely on the filter to block out the third (larger and harder to kill) type. Why?

Cost Comparison - Treating 30 Quarts of Water

1. Micropur - 30 tablets (1 x 30) - $12.95 plus tax

2. Bleach - 120 droplets (4 x 30) - essentially FREE!!!

A huge three-quart size bottle of bleach costs only $1.79 in a supermarket. 120 droplets thus cost essentially nothing!

Finally, the carbon element in Frontier Pro will remove bad taste in water -- including chemical tastes like chlorine (bleach) or chlorine dioxide (Micropur) -- so no problems treating with either.