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Congrats to Mrs TSK.
Never drink water where there's livestock upstream (everywhere on Exmoor). Sheep and cattle dump a lot of Cryptosporidium into the water course. https://en.wikipedia.org/wiki/Cryptosporidium
Get a Sawyer filter, or some tablets next time.
turnpedal-
Chlorine isn't effective against Cryptosporidium and iodine tablets aren't super effective against Giardia or Cryptosporidium.
"We demonstrated that iodine was not effective against Cryptosporidium even after 4 hours of contact with two tablets"
from: PDF study: http://www.wemjournal.org/article/S1080-6032(97)70019-X/pdfI carried tablets during TCR just in case but I don't even know what type they are - think iodine. Seems like a filter is better idea for this kind of thing.
hippy
Congratulations on a good ride. Mrs. TSK proudly became the first woman finisher although is now come down ill with a stomach bug. Possibly from drinking river water.