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Puure® 3.0 Under-Sink. Under-sink filter

Installation
guide

Install your filter in 15 to 30 minutes, no plumber needed. Follow each step in order.

15–30 minutes Adjustable wrench only No experience required
Puure® 3.0 Under-Sink, ready to install
Your filter version
Some steps differ between the two housings. Pick yours and the guide adapts.
Puure 3.0 Under-Sink kit contents
Puure 3.0 Under-Sink kit contents
What's in the box

Your installation kitStainless steelPlastic

Before you start, take a minute to check that everything is included. This ensures a smooth installation.

  • 1 Puure® filter housing (stainless steel head and body)
  • 1 Puure® filter cartridge
  • 2 connection hoses (inlet and outlet)
  • 1 installation guide
  • 1 Puure® filter housing (plastic head and body)
  • 1 Puure® filter cartridge
  • 2 connection hoses (inlet and outlet)
  • 2 screws and 2 wall plugs, for optional wall mounting
  • 1 installation guide

You will also need: an adjustable wrench (to loosen existing fittings and tighten the new hoses) and a small bucket (to catch residual water).

Parts of the filter

  • 1 Filter housing — rigid outer shell that holds the filter cartridge.
  • 2 Filter cartridge — replaceable filter element made of compressed activated carbon.
  • 3 Filter head — top part that receives the water and holds the cartridge.
  • 4 Inlet hose — hose connected to the cold water supply.
  • 5 Outlet hose — hose connected to your kitchen tap.
Parts of the filter
Parts of the filter

Technical specifications

Model Puure® under-sink system
Cartridge material Activated carbon block
Operating pressure 0.7 – 8.6 bar (10 – 125 psi)
Water temperature 5 to 38 °C (41 – 100.4 °F)
Flow rate 2.5 L/min
Cartridge life 4 to 6 months depending on household size and water quality
Compatible water source Mains drinking water only
Before you start

Choose your connection point

Your filter can be installed in two equivalent ways, choose the most accessible one in your space. This guide illustrates option A (the most common). For option B, simply replace the cold water hose with the angle valve in each illustration.

Option A Option A

On the cold water hose

Connect the filter to the flexible hose that supplies cold water to the faucet. This is the most common method, compatible with most installations.

or
Option B Option B

Directly on the angle valve

Connect the filter directly to the angle valve (shut-off valve). Use this if your existing hose is too short or difficult to access.

01
Preparation

Identify cold water & shut off the valve

First, locate the cold water supply under your sink and turn off the water.

  • a Open the faucet and touch both pipes. The one that stays cold is the pipe to connect to the filter (usually blue or labeled).
  • b Close the shut-off valve by turning it clockwise. Reopen the faucet to confirm the water has stopped flowing.
  • c Place a bucket under the pipes to catch residual water. Allow at least 5 cm of clearance below the filter location.
The filter can connect directly to the existing flexible hose (method A, most common) or to the angle valve (method B). This guide illustrates method A.
02
Optional

Mount the wall bracket

The bracket holds the filter under the sink at an accessible height. This step is optional but recommended.

  • a Choose a location with enough clearance to remove the filter body when replacing the cartridge.
  • b Position the bracket and mark the fixing holes with a pencil using the bracket holes as a guide.
  • c Drill the holes with a suitable drill bit, then screw the bracket in firmly.
03
Assembly

Assemble the filter

Insert the cartridge and lock the head onto the filter body. A visual guide mark helps with assembly.

  • a Remove the plastic film from the cartridge. Place it vertically into the filter head. Press firmly and screw gently.
  • b Align the head and body so the marks are offset: the line on the head should be about 45° to the left of the arrow on the body.
  • c Push vertically until it stops, then rotate clockwise until both marks align. The filter is locked.
04
Disconnection

Disconnect the existing cold water hose

Before connecting the filter, you need to disconnect the existing cold water hose from its supply.

  • a Loosen the nut: use an adjustable wrench to loosen the nut connecting the cold water hose to the faucet.
  • b Remove the hose: unscrew it by hand and let the residual water drain into your bucket.
05
Connection

Connect the hoses to the filter

Each filter has a clearly labeled IN port (left) and OUT port (right). Use them to connect the correct hose to each side.

  • a Attach the inlet hose (female nut) to the IN port on the left of the filter. Tighten firmly by hand.
  • b Attach the outlet hose (male thread) to the OUT port on the right of the filter. Tighten firmly by hand.
  • c Use the wrench for one final moderate turn, just enough to ensure a watertight seal. Do not overtighten.
06
Connection

Connect to the water supply and faucet

Connect the hoses now attached to the filter to the cold water supply and to the faucet inlet.

  • b Screw the end of the inlet hose onto the cold water supply (where the original hose was connected). Tighten firmly with the wrench.
  • c Screw the outlet hose onto the faucet inlet. Tighten moderately with the wrench, do not overtighten.
07
Verification

Turn on the water and check

Last step: reopen the water supply and let the water run for 5 minutes to flush the new cartridge.

  • a Reopen the shut-off valve by turning it counter-clockwise.
  • b Open the faucet and let cold water run for 5 minutes. This flushes and activates the cartridge.
The water may appear black or grey at first, this is normal. It is activated carbon dust from the new cartridge. It disappears within a few minutes of flushing.

Activate the cartridge timer

The timer (Life Timer) is set to your subscription cycle. It tells you, with a light and a beep, when it is time to replace the cartridge. Always replace it on time: a used cartridge no longer holds back contaminants effectively.

Attach the timer

A double-sided adhesive pad is fitted to the back of the timer. Choose a clean, flat and dry surface and wipe it before sticking. You can also attach it directly to the top of the filter. Avoid areas exposed to splashes, direct sunlight or heat sources.

Start the countdown

On first use and after every cartridge change, hold the button down for 3 seconds. You will hear a beep and the blue light flashes three times: the countdown has started. A short press checks the cartridge status at any time.

Remaining life Short press (check) Automatic reminder
30 days or more Blue light 3 s · 3 beeps None
Less than 30 days Red light 5 s · 3 beeps Every 8 hours
Expired Red light 10 s · 3 beeps Every hour
After installation

Care & Maintenance

A few simple steps to maintain optimal performance over time.

Cartridge replacement

Every 4 to 6 months

Replace the cartridge in line with your subscription, every 4 or 6 months depending on your household and water quality, or as soon as the timer light turns red.

Housing maintenance

Every 2 months

Clean the filter housing every 2 months with a clean cloth.

Recycling

Used cartridges

Used cartridges can go in your household waste. To have them recycled, contact us: customercare@puurefilters.com

Safety information

  • Maximum operating temperature: 38 °C. This system is designed for use with cold water only.
  • Do not expose the filter to frost. Do not fit to a hand shower.
  • Protect the filter from knocks and never force the fittings.
  • Replace the cartridge in line with your subscription (every 4 to 6 months) or as soon as the timer tells you to.
  • Needing to replace the cartridge early is not a fault: it means your water carries a high level of impurities.
  • If the water in the pipes is very cold, condensation may form on the filter housing.
  • To check your water quality, you can have it analysed by a specialist laboratory.
  • Only use Puure-branded cartridges. Using a cartridge from another manufacturer voids the warranty.
  • In line with current regulations, this filter must only be used on a drinking water supply fitted with a backflow prevention device.
  • Before installing, make sure you comply with your country standards for tap water.

This guide may contain errors or inaccuracies. The information it contains is checked regularly, and any necessary corrections will be made in future editions.