Ensuring safe drinking water for those without!

Leo LawrensonRotary Club of Buford/North Gwinnett

For children in developing countries, each year contaminated water causes:

2 million deaths1.5 billion episodes of diarrhea

The Microbiology of Solar Water Pasteurization, with Applications in East AfricaRobert MetcalfProfessor, Biological SciencesCalifornia State University, Sacramento

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Background Facts Pasteurization kills microorganisms that cause disease Pasteurization occurs at (or below) 65 C/149F

What is a WAPI? Invented by Fred Barrett and Dale Andreatta WAPI is a simple thermometer Polycarbonate tube containing wax Wax melts at or above pasteurization temperature Indicates when heated liquid has been pasteurized Eliminates need to boil water or milk Saves fuel Reusable

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How do you use a WAPI?

How do you use a WAPI?

How do you make a WAPI? Materials List:

Polycarbonate tubing (3/8 OD, ID) Wax (Myverol 18-06) Washer (18-8ss, 3/8 ID, 1OD) Stainless steel wire cable (20#, 14 length) 2 Single Barrel Compression Sleeves Wire S Hook (3 annealed wire) Press-to-seal Bag (3x4 or larger) Instruction sheet

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Station 1Cut tubing into lengths of 2 1/2. Use PVC pipe cutters.

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Station 2Using a small propane torch, heat one tube end and crimp closed with pair of pliers and let cool.

Station 3Put wax inside tube (about 3/8 of wax) and add large washer over non-crimped end.

Station 4Using the propane torch, heat opposite end of tube and crimp closed using pliers. Let cool.

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Station 5Drill 1/32 diameter hole in each flattened end of tube.

Station 6Cut stainless steel wire cable into 14 lengths. Insert one end of the wire into a compression sleeve. Bend the cable end around and insert in the compression sleeve from the opposite end forming a loop. Using pliers, compress the sleeve to hold the loop of wire firmly .

Station 7Thread the wire through one end of the tube, up along the side of tube, under the large washer, and through the hole at the opposite end of the tube. Form a loop using the other end of the wire and a compression sleeve.

Station 8Test by hanging in 170+ water, check that wax melts, and no leaks.

Station 9Dry unit and insert into plastic snack bag along with "S" hook and Instruction on "How to Use.

SHIP EM!

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The Bottom Line:WAPIs are a critically important

international service project!

Ensuring safe drinking water for those without!

Leo LawrensonRotary Club of Buford/North Gwinnett

Water Pasteurization Indicators(WAPIs)Slide Number 2Slide Number 3What is a WAPI?Background FactsWhat is a WAPI?How do you use a WAPI?How do you use a WAPI?How do you make a WAPI?Station 1Station 2Station 3Station 4Station 5Station 6Station 7Station 8Station 9Slide Number 19Slide Number 20Slide Number 21What is a WAPI? The Bottom Line:WAPIs are a critically importantinternational service project!Water Pasteurization Indicators(WAPIs)