| 1 | The sink has a built-in water purifier. | |
| 2 | The typical BSF is 3 feet high. | |
| 3 | He works with volunteers to produce the water purifiers. | |
| 4 | A BSF can produce several dozen liters of clean water in an hour. | |
| 5 | We're developing a water purifier and hopefully some other things that might be beneficial. |
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