Four-by-four driving, 6th edn      ISBN 978-0-957585-6-6 Author: Tom Sheppard

Payload/range … . If you are already wondering why there is so much talk about weight, the philosophy of sound expedition planning revolves around taking care of the life-blood of the trip – the vehicle. It will already have enough to cope with on a demanding expedition and these are the very conditions in which a breakdown is unacceptable.

… resistant to chemicals like chlorine and iodine. See below.
• Small bugs – bacteria. Prolific. Main causes of stomach upsets. Can be filtered by the finest filters and killed chemically.
• Very small bugs – viruses … succumb to chemicals.
The weapons – for the bugs … use:
• Filters and purifiers
• Chemicals
• Heat and boiling