Does the label for the Canadian stuff mention protozoa (giardia, crypto)? The US version does not, because (1) the dosage is insufficient and (2) the exposure time is insufficient unless the water is clear and warm. In other words, Aquamira will kill bacteria and viruses but not the creatures whose proliferation started us all treating our water in the first place!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey