Buster + Punch Kitchen Tap Filter Replacement Guide

Quick answer

To replace the water filter in your Buster + Punch 4-in-1 Kitchen Mixer Tap, isolate the water supply, unscrew the filter housing, swap in the replacement water filter with its phosphate bead core, and reseal. If you are fitting the filter kit for the first time, install the housing and connections before inserting the filter. Always check for leaks before restoring full pressure.

Before you start: what you need and what to check

Gather the replacement water filter or filter kit, a clean cloth, a small bucket, and a spanner that fits your tap's filter housing. Confirm your tap is the Buster + Punch 4-in-1 Kitchen Mixer Tap, because these filters are designed for that model. Turn off the water supply at the isolation valve or mains and open the tap to release pressure.

• Check the filter housing for cracks or worn seals before refitting.
• If you are unsure whether you need just the filter or the full kit, the kit is for first-time installation or if the housing is damaged.
• Work over a bucket to catch drips, and keep the area dry to avoid slipping.

Step 1: Isolate the water supply and drain the tap

Close the isolation valve under the sink or turn off the mains. Open the kitchen tap to let any remaining water drain out. This prevents water spraying when you open the filter housing. If your tap has a separate filtered water lever, open that too.

Step 2: Access the filter housing

The filter housing is usually located under the sink, connected to the tap's filtered water line. Locate the cylindrical housing and place your bucket underneath. If you have a filter kit, the housing may be part of the kit; otherwise it is the existing housing.

Step 3: Remove the old filter

Unscrew the housing bowl by hand or with a spanner if it is tight. Take out the old filter and dispose of it according to local regulations. Wipe the inside of the housing with a clean cloth and check the O-ring seal for wear or debris.

Step 4: Install the new filter

Unwrap the new replacement water filter and insert it into the housing, ensuring it seats fully. If you are installing the filter kit for the first time, follow the kit instructions to mount the housing and connect the tubing before inserting the filter. Hand-tighten the housing bowl—do not over-tighten, as this can damage the seal.

Step 5: Restore water and check for leaks

Slowly reopen the isolation valve or mains. Open the tap and let water run for a few minutes to flush the new filter. Check all connections for leaks. If you see drips, tighten the housing a little more or reseat the O-ring. Run the filtered water for at least two minutes before drinking.

How often to change the filter and why scaling matters

The phosphate bead core in Buster + Punch filters is designed to reduce scaling, which helps protect your tap and maintain water flow. How often you change the filter depends on your water hardness and usage. A common sign it is time is a noticeable drop in flow or a change in taste. If you live in a hard water area, check the filter more frequently.

When to use the filter kit instead of just the filter

The replacement water filter is for routine changes when the housing is already installed. The filter kit includes the housing and connections, so it is the right choice for first-time installation or if your existing housing is damaged or missing. Both use the same phosphate bead core to reduce scaling.

Filter replacement steps at a glance

1. Isolate and drain: Turn off the water supply and open the tap to release pressure before opening any housing. Checkpoint: no water should run from the tap before you proceed.
2. Open the housing: Place a bucket under the filter housing, then unscrew the bowl by hand or with a spanner. Mistake to avoid: forcing a stuck housing can crack the bowl—if it resists, check for a locking collar.
3. Swap the filter: Remove the old filter, clean the housing, and insert the new replacement water filter, checking the O-ring seal. Checkpoint: the new filter should sit flush and the O-ring should be free of grit.
4. Reseal and test: Hand-tighten the housing, reopen the water supply, and run the tap for a few minutes. Mistake to avoid: over-tightening can damage the seal—tighten firmly by hand only.
5. Flush and inspect: Let water run until clear, then check all connections for leaks over the next few hours. Next step: note the date so you can plan your next filter change based on water hardness.

Products mentioned in this guide

• KITCHEN TAP / REPLACEMENT WATER FILTER: Replacement water filter for the 4-in-1 Kitchen Mixer Tap, with a phosphate bead core to reduce scaling. This is the routine replacement part you need when the housing is already fitted and you just want to refresh the filtration.
• KITCHEN TAP / REPLACEMENT FILTER KIT: Water filter kit for use with the 4-in-1 Kitchen Mixer Tap, featuring a phosphate bead core to reduce scaling. Choose the kit if you are installing filtration for the first time or need to replace the housing as well as the filter.
• KITCHEN SHELF / HANGER / WITHOUT LOGO / STONE: Heavy-duty kitchen shelf made from laser-cut 4mm aluminium with a hand-polished guard rail and pan rail, supplied with 6 S hooks. If you are reorganising under-sink storage to make filter changes easier, this shelf keeps utensils and tools within reach.