Well, the good news is after you have giardea, you are then immune to it!

Yeah, the filter bottle doesn't filter out virus-sized scum, but it does remove microorganisms including 99.9999% of E. coli and other bacteria and 99.98% of protozoa including Giardia and Cryptosporidium. It also removes 95%+ of volotile organic compounds, pesticides, herbicides and petroleum by-products.

Nanci