Chemistry Students cleaning water with BioSand Filter
When chemistry students began studying a local stream’s questionable water quality, their teacher decided to introduce them to a treatment method that’s providing safe water for over 1.5 million people: the BioSand Filter.
The Hamilton District Christian High School students worked with Samaritan’s Purse Canada’s model to build their own filter from plastic materials.
The technology is simple: water poured into the filter passes through a naturally forming bio layer where dangerous micro-organisms are eliminated, then through carefully selected layers of sand and gravel. When the water comes out of the filter spout a few seconds later, it’s entirely safe for anyone to use for drinking, bathing, and cooking.
BioSand Filters last for many years, require no power supply, and have no moving parts to wear out.
While construction of BioSand Filters has been refined to an efficient, rapid process during the past 20 years, the students found their own process challenging.
“We made some mistakes along the way, like when we used hot glue to fasten the tubes to the plastic tub and we ended up with lots of leakage,” said student Jon Spears. “We really struggled to reseal it, but we managed to do it, and it felt good to be able to resolve the problem.”
Once the students finished construction and poured stream water into their filter, they saw how effective BioSand filter technology is in transforming polluted water.
“Getting the test results back and learning that the filter had removed the e-Coli bacteria was so rewarding,” said student Jessica Star. “It was really fulfilling to see our hard work pay off.”
Spears noted the project “expanded our knowledge of what is actually in water, and how important safe water is to our health. It made me appreciate our access to clean water—not just to drink, but to clean and bathe in, too.”
Leon Hordyk, who teaches the chemistry class at Hamilton District Christian High, said the students’ excitement and pride at constructing a working filter convinced him to keep the filter in his classroom.
“We will be sharing this story with future chemistry classes,” he added.