Signs Your Water Filter Needs to Be Replaced (And What to Do About It)

Not sure when to change your water filter? Learn the top signs your water filter needs replacing and how to keep your drinking water safe, clean, and fresh.

Is Your Water Filter Still Doing Its Job?

If you're using a water filter system at home, you're already ahead of the game when it comes to clean, safe drinking water. But like any other part of your home, filters don’t last forever — and over time, they lose their ability to trap contaminants.

Knowing when to replace your filter is essential. Otherwise, your system could stop working effectively, and you could be unknowingly drinking or showering in poor-quality water.

Here are the most common signs that it’s time to swap out your water filter — plus what to do next.

🚩 1. Bad Taste or Odour in Your Water

This is often the first and most obvious sign. If your water starts to taste metallic, musty, or has a strong chlorine smell, your filter may be saturated with contaminants and no longer able to purify effectively.

✅ Solution: Replace the filter cartridge immediately. For under-sink or reverse osmosis systems, check if you're past the recommended lifespan (usually 6–12 months).

🚿 2. Reduced Water Pressure

Is your water flow slower than usual? Over time, sediment and mineral build-up can clog your filter, especially in areas with hard water. A drop in pressure could indicate that the filter is overloaded and restricting flow.

✅ Solution: Replace clogged filters with a new set. If the issue continues, your membrane or housing may need cleaning.

⏰ 3. It’s Been Over 6–12 Months

Even if everything seems fine, most water filters have a recommended service life, typically:

• 6 months for carbon filters
• 12 months for sediment filters
• 2–3 years for reverse osmosis membranes

✅ Solution: Set a reminder to replace your filter regularly. It’s always better to change a filter before problems start.

💧 4. Cloudy or Discoloured Water

If your water appears cloudy or has a tint, it may mean the filter is no longer removing sediment, rust, or microscopic particles.

✅ Solution: Install a fresh sediment or activated carbon cartridge. This is especially important for households with older plumbing or well water.

🛑 5. Visible Build-Up or Mold in the Housing

Sometimes the clearest signs are... well, visible! If you see dark spots, mold, or sediment build-up inside the filter housing, it's definitely time for a change.

✅ Solution: Sanitize the housing and insert new filters. Always wear gloves and follow the manufacturer’s guidelines for safe handling.

What Happens If You Don’t Replace Your Water Filter?

Neglecting filter changes can:

• Lead to bacterial growth
• Decrease the lifespan of your entire filtration system
• Affect your skin, appliances, and overall water quality
• Create false peace of mind, making you think your water is clean when it’s not

How to Replace Your Water Filter (The Right Way)

1. Turn off your water supply.
2. Remove the old filter(s).
3. Clean the housing with warm water or food-safe sanitizer.
4. Install the new cartridge and reattach.
5. Turn the water back on and flush the system.

Need help? At Ecofilter Ireland, we offer expert advice and even installation support across Ireland.

💧 Shop Replacement Filter Sets at Ecofilter Ireland

We stock high-quality replacement filter sets for reverse osmosis, under-sink, whole house, and shower systems — all using EU-manufactured cartridges for safe, consistent performance.

👉 Browse filter replacements now
👉 Not sure which one you need? Contact us

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