How to Install a Shower Filter in 2025 (6 Easy Steps + Pictures)

Installing a shower filter in 2025 is easier than ever — and we’re here to guide you through it step by step.

At PureShowers, we were the first store in the UK dedicated solely to shower filters, established back in 2008. Since then, we’ve collected nearly 5,300 real reviews from real customers. Over 17 years, we’ve listened carefully to every bit of feedback about installation problems, mistakes, and quick fixes. That’s why this isn’t just another generic guide — it’s the definitive article, built on thousands of real-life experiences.

In 2008, shower filters were fairly simple. Most used just granular activated carbon (GAC) to reduce chlorine and odours. Fast-forward to 2025, and things have changed dramatically. Modern filters use advanced media like Activated Alumina (to reduce fluoride), KDF, Vitamin C, and new formulations that tackle modern concerns such as PFAS (“forever chemicals”) and microplastics. These innovations are great for your skin, hair, and health — but they also mean installation has evolved slightly.

Don’t worry though: with our six easy steps (plus a few pro tips), you’ll have your filter installed in no time.

What You’ll Need Before Starting

• Adjustable spanner – only necessary for fixed shower heads, and only if the shower head has been in place for years without removal. Hand-held shower heads don’t usually require it.
• Plumber’s tape – supplied with all of our hand-held shower heads and many of our in-line filters.
• Soft cloth – to protect chrome finishes while tightening.
• New filter cartridge – if you’re replacing rather than installing new.

💡 Expert tip: These tools and tips are based directly on the experiences of thousands of customers since 2008.

The 6 Easy Steps to Install a Shower Filter

Step 1. Preparation
Turn off your shower, clear the surrounding space, and have your tools ready.

💡 Pro tip: Dry the shower surfaces first. If they’re wet, you won’t get a firm grip when tightening the shower head or filter.

Step 2. Remove Existing Shower Head
For fixed filters: unscrew the shower head from the wall fitting.
For hand-held filters: unscrew the existing shower head from the hose.

💡 Pro tip: If you’re installing a new hand-held shower head, consider replacing the hose as well. Old hoses often harbour lime scale and contaminants, and a fresh hose helps you get the best start.

Step 3. Clean Threads
Remove any old plumber’s tape and debris.

💡 Pro tip: If the threads are clogged with gunk, scrub them gently with a toothbrush until the grooves are clearly visible. This one small step prevents leaks later — and it’s a mistake we’ve seen countless times in customer feedback.

Step 4. Wrap Plumber’s Tape
Plumber’s tape ensures a leak-free seal.

For fixed shower heads: wrap tape around the male threads on the wall outlet.
For hand-held heads: wrap tape around the male threads of the shower head before attaching it to the hose.

💡 Expert insight: Based on over 5,300 reviews, skipping plumber’s tape is the number one cause of leaks.

Step 5. Install O-Ring / Rubber Washer and Attach the Filter
Before attaching the filter, place the O-ring (rubber washer) in position — this small part is essential because it creates a watertight seal and prevents leaks.

For fixed shower head filters: install the washer inside the shower head connection.
For hand-held shower filters: install the washer inside the hose connection.
In both cases, the washer should always be seated correctly before screwing the filter into place.

Once the washer is in, screw the filter into place by hand. If it’s a fixed head filter, you may gently tighten with a spanner — but usually this isn’t necessary.

💡 Pro tip: The plumber’s tape you used in the previous step doesn’t just prevent leaks — it also acts as a lubricant, making it much easier to remove the filter later when it’s time to change cartridges.

Step 6. Flush Shower Filter
After attaching the shower filter to the pipe or the shower hose, then run the water for 30–60 seconds. This clears out carbon dust and activates the filter media.

💡 Customer insight: One of the most common questions we’ve received since 2008 is, “Why does coloured water come out of my filter at first?” The answer is simple: it’s just harmless carbon dust or unsettled filter medium. Flushing is essential before your first use, and after that your water will run clear and clean.

Maintenance & Real-World Tips

• Replace cartridges every 3–12 months, depending on the type of shower filter you have, the water quality in your area, and how much you use it.
• Signs it’s time: reduced water pressure, unusual odour, or discoloured water.
• Many 2025 models even come with colour indicators or app reminders to make this easier.

Troubleshooting & Expert Advice

• Leak at the joint? Almost always caused by missing or poorly applied plumber’s tape.
• Weak water flow? Time to replace the cartridge.
• Strange taste or odour? Flush the filter for longer.

These solutions aren’t theory — they come straight from thousands of real-world customer experiences since 2008.

Final Thoughts

Installing a shower filter might sound technical, but really — if you can screw on a jar lid, you can do this.

As the UK’s first dedicated shower filter store, established in 2008, and with nearly 5,300 customer reviews, we’ve distilled nearly two decades of expertise into this guide. Follow these six easy steps, and you’ll enjoy cleaner, healthier water from day one.

Your 2025 shower filter journey starts here — and it’s simpler than you think.