Do Water Filters Expire? What Happens if You Keep Using Them

Do water filters expire? Yes. Whether used daily or left unopened in the cupboard, every filter has a time limit. Once it reaches capacity, its ability to reduce impurities declines. Therefore, replacing it becomes essential for cleaner, fresher-tasting water.

We’ll also explore best practices for storage and maintenance. Plus, we’ll see why our built-in Total Dissolvable Solids (TDS) meter shows when it’s time to replace a filter.

How Long Do Water Filters Last Before They Expire?

A water filter is designed to process a certain amount of water before the cartridge becomes less effective. For most homes, this translates to approximately 150 litres, or 1–2 months of use.

Factors that affect this timeframe include:

• Household size and water usage
• Water hardness
• And contaminant levels

Culligan simplifies this process by including a TDS meter in every jug. The meter measures dissolved solids in parts per million (ppm). Once the reading is 006 or higher, the filter has expired and should be replaced. This gives you measurable proof, rather than relying on estimates.

Every filter cartridge also has an expiry date printed by the manufacturer. Therefore, check the label on the packaging for the most reliable information. Always follow the ‘use by’ date on the carton. Keep unopened cartridges in a cool, dry spot, away from direct sunlight and harsh chemicals.

For further details on cartridge lifespan, see our guide on how long ZeroWater filters last.

3 Clear Signs Your Filter Has Expired

Every filter eventually reaches a point where it can no longer effectively reduce impurities. If you ignore the signs, more contaminants can get in. This can alter the taste, compromise safety, and potentially damage your appliances.

1. Taste or Smell Changes

If water tastes metallic, flat, or has an unusual odour, the filter is no longer working as it should. The DWI confirms that while UK supplies are treated to high standards, plumbing and storage can still affect taste. An expired filter makes these changes more noticeable.

2. Slower Water Flow

In areas with hard water, calcium and magnesium can clog cartridges more quickly. This reduces the flow and requires you to change them more frequently. See the DWI’s guide to water hardness for local context.

3. TDS Reading Above 006

Culligan provides measurable proof. Each jug includes a TDS meter that shows dissolved solids in parts per million (ppm). Once the reading is 006 or higher, it’s time to replace the filter. This ensures your jug continues to perform optimally. Discover more about TDS and its significance.

Stagnant, room-temperature water increases microbiological risk. HSE guidance emphasises keeping water systems cold, clean and moving to limit bacterial growth. Regular cleaning and timely cartridge changes support that goal. You can order new filters directly or subscribe to regular deliveries, so you always have one ready when your jug indicates it’s time.

Best Practices to Keep Your Jug Working Well

Taking care of your jug helps each filter perform at its best and keeps every glass tasting fresh. These simple steps make maintenance easier.

Rinse & Clean Regularly

Wash the jug, lid, and reservoir weekly with warm, soapy water. This prevents limescale and residue from building up, keeping filtered water clear and fresh.

Replace Filters on Time

A routine replacement schedule ensures consistent performance. Culligan’s TDS meter indicates the exact moment your filter has expired, allowing you to change it with confidence. Browse our jugs and dispensers to see models with this built-in feature.

Stay Stocked with Subscriptions

Running out of filters can mean relying on an expired one. A subscription keeps replacements arriving on time, saving you the hassle of reordering.

Keep Your Filter Fresh for Every Pour

Do water filters expire? They do, and changing them on time is the simplest way to keep your water safe and tasting fresh. With our TDS meter, you can see precisely when a filter has reached its limit, giving you confidence that every glass is as it should be.

Store filters appropriately, clean your jug, and keep replacements readily available. This will help you get the best performance from every cartridge. Culligan simplifies things with jugs that offer precise measurements. They also have flexible subscription options, so you’ll never run out.

Cleaner water starts at zero, so explore our replacement filters today and enjoy water you can trust, pour after pour.

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