The Pond Sand Filter is a device that takes pond water and makes it safe to drink by filtering out bacteria that is harmful to human beings. It's a proven technology but it has its limitations. Pros - No fossil fuels, solar power, or electricity required - Nearly effortless to pump - Purifies enough water everyday to provide hundreds of families clean & safe drinking water - The water purified is safe enough to be used for cooking (low or no iron in the water) Cons - Limited lifespan (minimum two years), needs to be replaced eventually like any filter - Increased complexity vs. the deep tube well (Murphy's Law - more can go wrong) - More vulnerable to vandalism than a deep-tube well (can unscrew and steal the faucets, etc) The person in the video is a local villager. She's not an expert in pond sand filters - but I wanted to see what the local perception of Pond Sand Filters are.
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