CareHomeDeskCareHomeDeskHSE guidance confirms that POU filters should be used at all outlets serving immunocompromised residents, changed at the manufacturer-specified interval (typically 3062 days), and logged in the L8 record.
Point-of-use (POU) filters are fitted directly to an outlet -- typically a tap or shower head -- to provide an absolute barrier against waterborne pathogens including Legionella and Pseudomonas aeruginosa. HSE guidance and NHS-aligned water safety guidance support their use at outlets serving residents who are immunocompromised or otherwise at significantly elevated risk, as an additional control alongside, not instead of, the wider L8 temperature and flushing regime. They are not a routine requirement across an entire care home unless the water risk assessment identifies a specific need.
Manufacturers specify a maximum service life for each filter model, commonly in the range of 30 to 62 days depending on the product and the water quality at the site, after which bacterial breakthrough becomes a real risk as the filter medium itself can become colonised. The interval must be based on the manufacturer's published data sheet for the specific product in use, not assumed from a generic figure, and hard water areas may require more frequent changes than the manufacturer's headline figure suggests.
A filter left in place beyond its rated life does not simply stop working -- it can actively make the water worse than having no filter at all, because a saturated filter membrane provides an ideal surface for biofilm growth that is then flushed intermittently into the water stream. Staff and residents who see a filter fitted often assume the outlet is safe, which makes an expired filter a source of false reassurance as well as an active contamination risk.
Every POU filter installation and subsequent change must be recorded in the site's L8 water hygiene log, showing the outlet location, filter model, date fitted and date due for replacement. Many providers find it effective to write the due date directly onto the filter housing with a permanent marker in addition to the central log, so that any member of staff passing the outlet can visually confirm whether it is within date.
POU filters should not remain in place indefinitely once the resident or risk factor that justified them is no longer present, since ongoing use without a documented reason weakens the overall clarity of the water risk assessment. Their continued use, along with any removal, should be reviewed at each water risk assessment update, and the reasoning recorded so that an inspector can see the decision was deliberate and current rather than a legacy fitting nobody has revisited.
CareHomeDesk gives you compliance checklists, maintenance logs, and contractor management tools built around exactly this kind of knowledge.