A dual-action vent check valve is disclosed. The control device includes a processor and a memory storing computer-readable instructions. The full flow filter, bypass filter, and conduit are positioned such that the bypass filter is downstream of the full flow filter, and the pressure reduction section creates a pressure differential across the bypass filter that draws a predetermined portion of the fluid through the bypass filter. The optimization analysis may be performed offline from the execution system. The video switching module switches among the video signals from the input systems according to a switching instruction from the video switching instruction module. With the present invention, it is possible to provide water having different levels of hardness at one or more connected water removal stations with a water softening plant in a convenient manner.