CMS SOM App. H, Tag V189

5.2.3 Cartridge filters (equipment configuration)

6.2.3 Cartridge filters (monitoring)

5.2.3 Cartridge filters

The cartridge is contained within an opaque filter housing with seals to separate the feed

and product water streams.

When the maximum [pressure drop] ∆P recommended by the filter manufacturer is

reached, the cartridge should be replaced according to the manufacturer’s instructions.

6.2.3 Cartridge filters

Cartridge filters should be monitored on a periodic…. basis for a [pressure drop] ∆P across

the filter [that] can be used to determine when the filter is retaining particulate matter to

the point that the filter will no longer allow the required water flow without an excessive

reduction in pressure at the outlet of the filter. A marked decrease in ∆P without a

corresponding decrease in flow rate may indicate a loss of filter integrity. Follow the

manufacturer’s recommendations concerning when to replace cartridge filters.

Replacement of the cartridge will usually be indicated by an increase in ∆P to some

specified value. A log sheet should be developed to record the pressure drop measurements.

Interpretive Guidance § 494.40(a)

ANSI/AAMI RD52:2004

5.2.3 Cartridge filters

Cartridge filters consist of a cylindrical cartridge of the filter medium with a central drainage

core. Although cartridge filters may be installed at the inlet to a water system, their usual

application is as a final filtration step before reverse osmosis.

As the cartridge accumulates particulate material, resistance to flow through the filter increases,

as indicated by an increase in ∆P.

Suggested monitoring guidelines from ANSI/AAMI RD52, Table 4 include:

For cartridge filters: monitor for pressure drop across the filter daily, looking for a pressure

drop less than a number determined by facility policy. Since some values are system-specific, the

facility should define an acceptable operating range for monitoring pressure drops based on the

manufacturer’s instructions or measurements of system performance.

Additional Guidance:

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Cartridge filters are not required in every facility; the source water should determine the

necessary water treatment components. If cartridge filters are in use, the facility must follow

these requirements.

A marked decrease in ΔP could indicate that there is no filter in the container.