Fulfilled by our friends at GrimworkshopKnowledge is power, and with Grims weatherproof tip cards that knowledge is at your fingertips!
This Weatherproof plastic tip card, is basic instruction on solar water disinfection, as well as a simple natural filter for solar disinfection, with both a visual guide, and written instruction it is a great reference to keep on hand. This card is both waterproof, and U.V. Reisistant, so its perfect to always keep in a wallet. These tip cards are so thin, you can stack dozens together into one wallet slot, or into a small tin.