Abstract: A check valve formed from a body having inlet and outlet interior chambers with the outlet chamber functioning as a diffuser when assisting in the arrest of reverse water flow. A seat base is positioned between the inlet and outlet chambers with a tubular sleeve for housing a stem having a lip positioned along one end and a threaded opposite end secured within the inlet chamber. A spring fits around the stem and a sphere is secured to the threaded end of the stem for engaging the seat base. Movement of the sphere away from the inlet chamber allows dry polymer to pass when the spring is compressed. Upon loss of force capable of moving the sphere away from the inlet chamber, relaxation of the spring allows the sphere to engage the seat base with an attached grommet before water can flow backwards into the interior chamber.