Modeled after old well pumps (many of which are still in use), you can stick the $35 Pocket Well into any water source (sorta...it seems like it still may require two-hand operation).

• 它看起来像老式的井泵（现在仍在使用），只要花35美元，你就可以净化任何水源（不过仍需两只手操作）。