If you’re wondering how to change your water filter cartridges and how to pre-flush, you’re in the right place. Water filter cartridges are easy to replace and easy to flush.
Be it a carbon block filter, sediment filter cartridge or even fluoride removal, there’s a process you need to follow. To create the best tasting filtered water, please follow the IMPORTANT steps below to ensure there will be no issues with your water filter.
Table of contents
Instructions for Systems That Use Fluoride Removal Cartridges
All fluoride removal cartridges MUST be FLUSHED with flowing water inside your water filter for 10 minutes minimum with NO other cartridges installed after the Fluoride cartridge before use.
Note: Your fluoride removal cartridge is usually installed in positions 1 or 2 in your water filter.
- Put down a towel under the water filter just in case water spills into your cupboard
- Turn off the incoming water supply. Open the drinking water faucet to release any pressure.
- Use the housing removal tool to loosen the housings on the water filter.
- Unscrew the housings from the water filter with your hands.
- Lift out one housing at a time up onto the sink. (Note: There will be water inside the housings, so be careful not to spill it)
- Remove all water filtration cartridges from inside your water filter, noting the position of each cartridge.
- Remove the plastic wrapping from each cartridge. Install the fluoride removal cartridge & any sediment cartridge that goes before the Fluoride removal cartridge inside the water filter, with NO OTHER cartridges installed after the fluoride removal cartridge.
- Ensure all housings are installed prior to any flushing.
- Turn on the water and let water flow through the water filter to flush the fluoride removal cartridge for at least 10 minutes. (This water can be collected for plants if so desired).
- After flushing water through the fluoride removal cartridge for 10 minutes minimum, turn off the water supply then turn on the drinking water filter faucet to release any water pressure.
- Remove the housings for any other cartridges you need to install. Install these cartridges in the same order and positions they were removed from. (See cartridge images included if required).
- Tighten all housings, turn the water supply back on and check for any leaks.
- Turn on the water filter faucet and flush the full system for a further 5 minutes with ALL cartridges installed.
After following all the steps above, you may now use your water filter.
Instructions for Systems That Do Not Use Fluoride Removal Cartridges
- Put down a towel under the water filter just in case water spills into your cupboard
- Turn off the incoming water supply. Open the drinking water faucet to release any pressure.
- Use the housing removal tool to loosen the housings on the water filter.
- Unscrew the housings from the water filter with your hands.
- Lift out one housing at a time up onto the sink. (Note: There will be water inside the housings, so be careful not to spill it)
- Remove all water filtration cartridges from inside your water filter, noting the position of each cartridge.
- Remove the plastic wrapping from each cartridge.
- Install ALL replacement cartridges in your water filter in the same order and positions they were removed from. (See cartridge images included if required).
- Turn on the water and flow the water through the water filter, flushing all the cartridges simultaneously for at least 5 to 10 minutes minimum. (This water can be collected for plants if so desired).
Note 1: All water filtration cartridges require flushing in some way. Fluoride removal cartridges MUST be flushed separately on their own, with NO other cartridges installed when new for a minimum of 10 minutes.
Note 2: Some cartridges say THIS WAY UP, this is for under sink water filter systems. For benchtop water filter systems, ENSURE the THIS WAY UP printed on the cartridge goes down into the base of the benchtop water filter head cap. The washer end of the cartridges goes into the head caps.
CARTRIDGE IDENTIFICATION

Polyspun Sediment Cartridge

Pleated Sediment Cartridge

String Wound Sediment Cartridge

Fluoride Removal Cartridge

Fluoride Removal Cartridge (Bottom)

Fluoride Removal Cartridge (top ring around washer)

Low Alkaline Cartridge

Low Alkaline Cartridge (Bottom)

Low Alkaline Cartridge (top smooth flat washer)

High Alkaline Cartridge

High Alkaline Cartridge (Bottom)

High Alkaline Cartridge (Top)
10" Disruptor Cartridge
Doulton Cartridge

Carbon Block Cartridge
CARTRIDGE POSITION GUIDE
Please note: Below are the ULTRAPURE water filter listings. The same applies to Coldstream, Doulton and/or Carbon water filter systems.
Just replace the cartridge with whatever filtration cartridge (Disruptor, Coldstream, Doulton or Carbon) you are using in these positions and flush as described.
ULTRAPURE 10” Single Stage System - is 1 x Disruptor cartridge only - install & flush 5 to 10 minutes.
• Benchtop: https://mywaterfilter.com.au/products/ultrapure-10-single-stage-benchtop-water-filter
ULTRAPURE 10” Twin Water Filter System with Sediment Protection - Sediment cartridge then Disruptor cartridge - install & flush 5 to 10 minutes.
• Undersink: https://mywaterfilter.com.au/products/ultrapure-10-twin-under-sink-water-filter-system-sediment-protection
ULTRAPURE 10” Twin Water Filter System with Fluoride Removal - Fluoride removal cartridge then Disruptor cartridge - Flush fluoride removal cartridge on its own 10 minutes - See the special flushing instructions above.
• Benchtop: https://mywaterfilter.com.au/products/ultrapure-10-twin-benchtop-water-filter-fluoride-reduction
• Undersink: https://mywaterfilter.com.au/products/ultrapure-10-twin-under-sink-water-filter-system-with-fluoride-removal
ULTRAPURE 10” Twin Water Filter System with Low Alkaline - Disruptor cartridge then Low Alkaline cartridge - install & flush 5 to 10 minutes.
Note: Please contact Sales at 02 5500 5310 if you're interested to avail the low alkaline system.
ULTRAPURE 10” Triple Water Filter System with Fluoride Reduction and Alkaline - Disruptor cartridge then Alkaliser cartridge - install & flush 5 to 10 minutes.
• Benchtop:
• Undersink:
ULTRAPURE 10” Triple Water Filter System with Fluoride Removal & Sediment Protection - Sediment cartridge then Fluoride removal cartridge, then the Disruptor cartridge - Flush Sediment cartridge & Fluoride removal cartridges together on own 10 minutes - See the special flushing instructions above.
ULTRAPURE 10” Triple Water Filter System with Alkaline & Sediment Protection - Sediment cartridge then Disruptor cartridge then the Alkaliser cartridge - install all cartridges & flush for 5 to 10 minutes.
• Undersink: https://mywaterfilter.com.au/products/ultrapure-triple-under-sink-water-filter-system-alkaline-sediment-protection
INSTALLING CARTRIDGE POSITIONS - Undersink Systems
Look at the new cartridge and check if it has an inscription called THIS WAY UP. Be aware that THIS WAY UP must face up into the spigot (water filter head cap) for the under sink water filter system.
If there is no THIS WAY UP on the cartridge, install the washer end of the cartridge up into the head cap.
To watch the video tutorial on how to change the cartridge in your undersink water filter, click here.
INSTALLING CARTRIDGE POSITIONS - Benchtop Systems
Look at the new cartridge and check if it has an inscription that says THIS WAY UP.
Be aware that THIS WAY UP must face DOWN into the spigot (water filter head cap) for the benchtop water filter system.
If there is no THIS WAY UP on the cartridge, install the washer end of the cartridge down into the head cap.
THIS WAY UP for a benchtop water filter means the up direction must go down into the head cap of the water filter, or the water will not flow.
To watch the video tutorial on how to change the cartridge in your benchtop water filter, click here.
If you have any questions or require help with your replacement cartridges, please contact us.







