Arranged in barrels of concrete or plastic, these biosand water filtration systems (BSFs) remove 95 to 99 percent of the bacteria, viruses, worms and particles contained in rain or surface water.

One of them is + pool, a water filtration system that permits floating swimming pools to be embedded in urban rivers, and which has taken a crucial step closer to fruition.

Water treatment plant operators monitor and operate computerized control systems and related equipment in water filtration and treatment plants to regulate the treatment and distribution of water.