BlogGuidesBy Hannah Reid1 November 2026

How Often Should You Change A Tap Water Filter?

Change your tap water filter cartridge when the manufacturer's instructions say so, as the Drinking Water Inspectorate advises for domestic filters. Flowpure specifies about 1,200 litres or up to 3 months for its Flowpure stainless steel tap filter, whichever comes first. This guide shows how to set that reminder, which signs are worth checking, and how to keep the routine simple.

In this guide:

• How Often Should I Change My Tap Water Filter?
• Do Jug, Tap And Under Sink Filters Have Different Intervals?
• What Signs Mean I Should Check The Cartridge?
• Can Heavy Use Or Hard Water Change The Schedule?
• How Should I Clean, Store And Dispose Of Filter Supplies?
• Why Is A Flowpure Filter Worth Having?

How Often Should I Change My Tap Water Filter?

The right interval is the one stated for your particular cartridge, not a number borrowed from another filter. The Drinking Water Inspectorate says domestic filter cartridges should be changed in line with the manufacturer's instructions, and its Manual on Treatment for Small Water Supply Systems says replacement for point of use units is usually recommended after a set time or a set volume of water filtered. So, keep the instructions somewhere handy, and record the date you fit each cartridge before the packaging goes in the bin.

For the Flowpure stainless steel tap filter, I would put a three month reminder in the calendar straight away and note the 1,200 litre capacity beside it. Flowpure describes the lifespan as up to 3 months, which makes that a planning limit rather than a promise for every household. If your family reaches the volume sooner, perhaps because of a lot of cooking and kettle filling, bring the change forward. In my opinion, a reminder with both limits is far more useful than waiting for the water to taste different.

Do Jug, Tap And Under Sink Filters Have Different Intervals?

Replacement intervals depend on the instructions for each jug filter, filter tap or under sink unit, because each system has its own cartridge and its own stated limits. The Drinking Water Inspectorate points to the manufacturer's schedule, and its treatment manual recognises both time and volume as the basis for replacement. A similar looking cartridge is no reason to borrow another product's schedule. I would write down the cartridge name, its time limit, its volume limit and where the instructions live, so that reordering refills becomes a two minute job rather than a hunt through drawers.

What Signs Mean I Should Check The Cartridge?

Tiny black particles in filtered water deserve a specific response. Dŵr Cymru Welsh Water's INFO 0080 jug filters leaflet says they suggest a fault and that the jug filter cartridge needs to be replaced. That guidance is about jug filters, so I would not stretch it into a diagnosis for every system. For a change in taste, smell or flow, check your own filter's instructions and your replacement record, and do not use a taste test to stretch the stated interval.

Why does an overdue cartridge matter? The Drinking Water Inspectorate says that if a cartridge is not changed in line with the instructions, the filter stops being effective and may release other chemicals or bacteria into the water. It also says that ignoring the maker's cleaning and replacement guidance causes a build up of deposits that can create a breeding ground for bacteria. I read that as a calm reason for a dependable routine: replace on schedule, clean as directed, and the filter keeps doing its job.

Can Heavy Use Or Hard Water Change The Schedule?

The Drinking Water Inspectorate's treatment manual says replacement is usually recommended after a set time or a set volume of water, so the interval depends on water quality. Heavy use therefore matters when your cartridge has a volume limit, and you should track litres alongside the calendar. For hard water, ask the cartridge manufacturer how its instructions apply to your water and usage, rather than inventing a shorter schedule yourself. Flowpure's stainless model is a filter, not a softener, so choose it for taste, chlorine and sediment, not for limescale.

How Should I Clean, Store And Dispose Of Filter Supplies?

Follow the cleaning instructions supplied with your jug or filter housing, including any steps for fitting a new cartridge. Dŵr Cymru Welsh Water says filters can become unhygienic if they are not changed or used properly, and it recommends using filtered water within 24 hours of refrigerating it. Keep that storage advice next to your replacement reminder, so the daily habit and the occasional maintenance are both easy to find.

For disposal, ask the cartridge manufacturer and your local recycling service whether they accept your particular cartridge before you choose a bin. I would check this when ordering replacements and keep the answer with the instructions. That is also a handy moment to confirm you have the right refill, update the fitting date and set the next reminder, so nothing is left to chance later.

Why Is A Flowpure Filter Worth Having?

In my opinion, a Flowpure stainless steel tap filter is worth having. Tap water that meets standards and tap water that tastes clean are different things, and Flowpure says its stainless model reduces chlorine and the unpleasant tastes and odours it leaves, while blocking sediment, rust and visible particles. It has a 304 stainless steel body and comes with 5 thread adapters, so you have options when fitting it to your tap. Those are concrete, everyday benefits, and they show up every time you fill a glass or a kettle.

The buying choice and the care routine belong together. Choose the Flowpure stainless steel filter, then give its cartridge a permanent place in your calendar, with the 3 month and 1,200 litre limits written beside the fitting date. A small routine buys you cleaner tasting water every day. When the next refill arrives, record the date, keep the instructions where you can find them and set the reminder.

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