A filter is the treatment most people now carry on British hills, and for good reason. It is light, it works in seconds rather than minutes, it needs no fuel, and the water tastes of water. But a filter is a sieve. It stops what is bigger than its holes and lets through what is smaller. Knowing which side of that line each hazard falls on is the whole skill.
In this lesson
What a filter can and cannot do
Hollow-fibre filters
When to use them
How
Common mistakes
Ceramic filters
Filters, purifiers and activated carbon
Filter or purifier?
When to choose a purifier
Activated carbon
Salt
Improvised sand and charcoal filters
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The rest of this lesson is in the full course
Every module, practical and exam, self-paced and private, with a certificate at the end.
£149.00Original price was: £149.00.£99.00Current price is: £99.00.
Places on the full course open soon. Module 1 is free to try now.
