Wonders of Water Science Project - Making Clean Water: After learning about pollution and water conservation, you could have your Brownies split into groups and make clean water that has been "polluted" with dirt and other sediments.
LifeStraw offers easy access to clean and safe drinking water anywhere! A Time Magazine "Invention of the Year" winner, LifeStraw is the most advanced, compact, ultralight personal water filter availa (Survival Water Filter Products)
Professional: water filtration system for the workplace. In my future workplace, this water system will save lots of trash from being made from the wasteful paper cups to the plastic container the water is kept in.
Sawyer Mini Water Filtration System - Drink straight from a puddle or stream with the filter or from the enclosed bag after filling it from a stream or pond. Does up to 100 000 gallons. Back flush to clean filter with syringe supplied