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Nepper and Stevenson water pasteurizer

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Nepper and Stevenson set to work with just a few components: two buckets, a pasteurizer and rays of sunshine. Water is poured into a bucket through a fine cloth, which sifts out any particles that may be present in the water. Water enters the corrugated pasteurizer through polyurethane tubing. The polypropylene plastic panel is painted black to absorb as much radiant energy as possible. A thin layer of clear mylar plastic goes over the panel, which Nepper and Stevenson said keeps wind from wicking away solar heat from the panel.

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Nepper and Stevenson set to work with just a few components: two buckets, a pasteurizer and rays of sunshine. Water is poured into a bucket through a fine cloth, which sifts out any particles that may be present in the water. Water enters the corrugated pasteurizer through polyurethane tubing. The polypropylene plastic panel is painted black to absorb as much radiant energy as possible. A thin layer of clear mylar plastic goes over the panel, which Nepper and Stevenson said keeps wind from wicking away solar heat from the panel. Radiant heat is transferred to a foam that maintains the temperature. Water heats up, until the thermostat hits 71 °C (159.8 °F), then pasteurized water flows into a separate bucket. The thermostat itself is custom-fabricated by Nepper. Originally, the two experimented using one similar to an automobile thermostat but the store-bought devices allowed some bad water to leak into the good. Nepper created one that was leak-proof and that fit into the pasteurizer easily. The invention produces 15.5 liters (4 gal.) of pasteurized water per hour, and probably more with stronger sunlight.