Compact, convenient home water treatment. Well PRO makes sink-staining iron and manganese, pump-clogging bacteria, and the rotten-egg smell of hydrogen sulfide a thing of the past. This sealed sanitizing system mounts directly over the well, protected by a thermoplastic shell that resists tampering, corrosion and weather damage. Inside, a supply of Well PRO pellets are automatically delivered by an adjustable control that releases the ideal amount to match your water use.