Read this article for a better understanding of the prevalence of much-feared Giardia in the Sierra Nevada. Basically, in two words, Giardia is uncommon, and you're more likely to get intestinal problems from poor hygiene or meals in restaurants in town.
On the PCT, I will be using the same treatment strategy I used on the CDT, namely:
- Drink from the best water sources possible: snowmelt trickles/streams, springs, and small streams coming out of ungrazed areas. Get water from larger streams when necessary.
- Treat only water that is not flowing rapidly or water from areas that might have been grazed (i.e. has been exposed to cow dung). I will use Aquamira tablets and drops.
Following this strategy, I hope to treat no more than 5-10% of the water I drink on the PCT.