Water questions & filter care

Understand a water concern before shopping

Household water filtration can address preferences such as taste or a practical problem such as kettle scale. It should not begin with an assumption that all UK tap water is unsafe. In England and Wales, the Drinking Water Inspectorate explains why treatment is generally unnecessary to make a compliant mains supply safe.

If the taste, smell or appearance changes unexpectedly, contact your supplier. Check whether the issue affects other taps or neighbours and follow any official advice. Do not cover up a suspected supply or plumbing problem with a new cartridge.

Use do you need a filter in the UK? for the initial decision. The supplier quality-report guide explains how to find local data, what a supply-zone report can tell you and when to contact the supplier about a current change.

Choose treatment for taste, scale or a named claim

• Taste and odour: activated carbon is commonly used for substances such as chlorine that affect taste. Choose the actual cartridge intended for this job.
• Limescale: look for a stated carbonate-hardness reduction claim. A household jug does not treat water flowing to the rest of your home.
• A named contaminant: find evidence for that exact substance, system and cartridge. Broad language about “impurities” does not show which claim has been independently verified.

Avoid treating a low dissolved-solids reading as a general safety certificate. It does not tell you whether a particular pollutant is present or whether a named reduction claim is met. If you need to investigate a specific concern, begin with supplier information and appropriate testing rather than a shopping comparison.

• Taste filtration versus limescale reduction separates two common purchase aims.
• Activated carbon versus ion exchange explains the media rather than the container.
• Water hardness units helps you interpret ppm, mg/L and degrees.
• Chlorine taste in tap water covers checks before shopping.
• Water filter versus water softener distinguishes drinking-water filtration from household hardness treatment.
• Under-sink carbon versus RO compares two treatment routes.

For an existing MAXTRA PRO jug, Pure Performance is the everyday taste option; Limescale Expert is the alternative to compare for hard-water scale. Match the cartridge to the compatible jug first.

A tap filter is a different choice: BRITA ON TAP retains calcium and magnesium, so it does not substitute for a scale-focused jug cartridge. For a specific supply concern, use the advice above before shopping.

Check certification and measurement claims

A standard number or logo needs context. Check the exact model, the named reduction claim and the conditions in the certifier's current listing. The NSF drinking-water treatment directory is one place to verify a product that claims NSF certification. A claim about one cartridge does not automatically apply to another cartridge carrying the same brand.

Follow the certification-checking workflow to compare model, cartridge, named claim and listing conditions. Read what a TDS meter can and cannot tell you before using a number to judge drinking-water quality or general cartridge performance.

Clean, store and troubleshoot a jug

Clean the container as its manual directs and replace the cartridge on its own schedule. Cleaning the jug does not reset the filter's service life. Remove or protect the components the manual excludes from dishwasher cleaning, including electronic lids where applicable.

Use the preparation instructions supplied with the new cartridge, including any required rinsing or discarding of initial fills. Record the fitting date and follow the stated time or volume limit. An indicator is a reminder to maintain the product; it is not a laboratory reading of your water.

Regular upkeep

• When to change the cartridge
• Cleaning the body, funnel, lid and indicator
• Resetting Memo and Smart Light
• UK cartridge recycling routes

Fitting and troubleshooting

• Preparing and fitting MAXTRA PRO
• Preparing and fitting Evolve+
• Slow filtering, trapped air and fitting checks
• Black specks: source checks and next steps

Storage and breaks

• Keeping filtered water in the fridge
• Holidays, unused jugs and restarting

Maintain a gravity filter and its candles

Gravity systems have separate care steps for the chambers, tap, seals and ceramic elements. Check the exact candle grade before cleaning; the British Berkefeld manufacturer range distinguishes current system and candle options.

• How to assemble and prepare a British Berkefeld gravity water filter
• How to clean a stainless-steel gravity filter: chambers, tap and seals
• How to clean ceramic water filter candles—and when to replace them
• Why is my gravity water filter slow? Water level, trapped air and blocked ceramic
• Gravity water filter leaks and overflows: finding the cause

Care for heated chilled and RO appliances

Match the label code and manual before using a cleaning or descaling recipe. Tank washing, flushing and heater descaling are different tasks; a method for a kettle or one Aurora revision is not a general appliance instruction.

• Filtered hot-water dispenser vs kettle: convenience, temperature and electricity costs
• Chilled water dispenser vs fridge filter jug: capacity, cooling and cleaning
• How to descale a filtered hot-water dispenser: model-specific methods
• How to clean a countertop RO water tank and manage leftover reject water

Maintain installed filters and diagnose faults

Work from the system model and symptom. Isolate a leaking unit as its instructions direct and use a competent installer where the shut-off, connection or pressure is uncertain.

• How to replace Waterdrop G3P600 filters: CF, CB and RO cartridges
• Tap-mounted water filter leaking at the adapter: seals, alignment and next steps
• Why is my tap-mounted water filter running slowly?
• Low flow from an under-sink water filter: cartridge, pressure and plumbing checks

For tap-mounted routine maintenance, use ON TAP cartridge replacement. For a staged system, record each cartridge and its own schedule.

Choose and budget for the correct replacement

For the Liscia, the refill family is Evolve+. Its preparation and replacement instructions belong to that cartridge, even when another brand of jug accepts it.

For a compatible Doulton installation, cleaning the ceramic element does not renew every filter stage or remove the need for replacement. Follow Doulton’s care guidance for the exact cartridge.

Keep the exact cartridge name somewhere you can find it, set a change reminder and store the jug as instructed. If filtering slows, water leaks or a taste persists, consult the model's troubleshooting guidance before assuming that the answer is a different filter.

Our cartridge starting point explains the main replacement distinctions. If you are choosing a first jug, the buying guide brings capacity, fit and cartridge cost together.

Use the running-cost calculator for the applicable time or volume limit, and the compatibility directory before ordering a different family.

Questions about water and filter care