For their investigatory project, the group created an improvised water filter to prove it can effectively filter dirty water. They tested the filter by pumping dirty water through it and repeating the filtration cycle. They found that over 9-15 cycles, the water became clearer as contaminants were removed. While it took several cycles to achieve clear water, the improvised filter using affordable materials like sand, pebbles and activated carbon was ultimately successful at filtering water, demonstrating it is an economical and environmentally friendly alternative to commercial filters.