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Apparatus is provided for use as an in-line fluid flow monitor through filter media of a variety typically employed in domestic applications upstream of a kitchen faucet as well as unusually low pressure water supplies. Apparatus includes an outer housing with an input port leading to a rotatable tu

Apparatus is provided for use as an in-line fluid flow monitor through filter media of a variety typically employed in domestic applications upstream of a kitchen faucet as well as unusually low pressure water supplies. Apparatus includes an outer housing with an input port leading to a rotatable turbine within the housing. The turbine, rotatable about a longitudinal axis, is coupled to an offset gear which, in turn, is coupled to a reduction gear train which includes first and second gear arrays mounted for rotation about a first and second axis located parallel with and spaced from the longitudinal axis. Fluid communication is provided from the turbine chamber through the gear train to an output port. The gear train ends in an output which is engaged in driving relationship with an oppositely disposed rotatable valve member having resilient pawl legs extending therefrom. The pawls are configured to engage the output to provide rotatable ratcheting movement. Fluid flow through the output port is inhibited when a camming stem affixed to the valve member encounters a slot component. Valve closure provides a cue to the user that a predetermined quantity fluid flow occurred. Resetting the apparatus to selected metering quantities occurs by hand manipulating the camming stem from the slot. Apparatus is additionally adaptable to be used with a fluid treatment system including a filter supported from a filter base. Resetting the monitor within the system can occur only when the filter is removed from the base.

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A system for treating fluid flowing along a fluid path, comprising: a filter base assembly having a receiving and supporting region and an oppositely disposed service region; a filter cover removably mounted upon said base assembly receiving and supporting region; a filter located within said filter

A system for treating fluid flowing along a fluid path, comprising: a filter base assembly having a receiving and supporting region and an oppositely disposed service region; a filter cover removably mounted upon said base assembly receiving and supporting region; a filter located within said filter cover, having a support portion removably receivable and supportable upon said filter base assembly at said receiving and supporting region; a flow monitor for determining the flow of a predetermined quantity of said fluid along said path, including: a housing mounted at said filter base assembly service region, having an input port for receiving fluid from said fluid path and an output port for returning said received fluid to said path, a reduction gear train positioned within said housing and having first to last gear reduction stages exhibiting a predetermined reduction ratio, a turbine mounted within said housing adjacent said input port, rotatably drivable by fluid incident thereon from said input port and coupled in driving relationship with said first gear reduction stage, a valve seat within said housing and including an open valve portion and a valve close portion, and a valve assembly mounted within said housing, having a drive component engaged in driven relationship with said last gear reduction stage, a valve member coupled in driven relationship with said drive component to move from a reset orientation on said valve seat open portion to a closed valve orientation at said valve close portion, said drive component including a ratchet assembly coupled to provide a rotatable driven relationship within said valve member first rotational sense and rotatable in an opposite sense by an applied reset force, said valve member being resiliently biased toward said valve seat, being movable under said bias from said reset orientation to said closed valve orientation to block fluid along said fluid path, and being rotatable between said reset orientation and said closed valve orientation, and said valve assembly having a reset component engageable to reposition said valve member to said reset orientation by moving it against said bias and applying said reset force thereon; and an access channel extending through said filter base assembly at said receiving and supporting region adjacent said reset component for providing access from said receiving and supporting region to engage said reset component only when said filter is removed from said filter base assembly.