A POU filter is an external filter that is fitted to a water outlet (taps and showers) to filter out microorganisms and debris.

A POU filter does not remove or kill the microorganism, but traps micro-organisms allowing for the safe use of the water.

The water safety plan (WSP) approved by the WSG should state the types of POU filter which can be used. The WSG should agree local processes and responsibilities for the requirement, installation, maintenance, management and removal of POU filters.

• Installation of POU filters may be considered by the WSG or an IMT where a potential or actual clinical risk has been identified as being associated with the water.
• Ensure when a POU filter is fitted there is no additional splashing or spraying of water and that water does not flow directly into the drain.
• POU filters should be replaced as per manufacturer instructions or if visibly contaminated, damaged, or leaking.
• POU filters may be removed when the Water Safety Group and/or IMT determines that water quality can be maintained without the use of the filter.
  • Once the POU filter is removed the outlet and its associated pipework should be immediately cleaned and flushed to remove any accumulated debris.