Replacement Cartridges
Maintain peak performance with genuine Armour replacement cartridges. Designed for reliable contaminant reduction and consistent flow, they keep your system delivering clean, great tasting water every day.
Water Filter Cartridges: Keep Your Filtration System Performing at Its Best
Your water filter is only as good as the cartridge inside it. No matter how advanced your system is, worn or overdue filter cartridges will reduce filtration performance, restrict flow, and allow contaminants to pass through that a fresh cartridge would have caught. At Armour Water, we stock a comprehensive range of replacement water filter cartridges to suit all major systems, so keeping your water filtration setup running at full capacity has never been easier.
We know that staying on top of maintenance is not always front of mind, especially when life gets busy. That is why we make the process as straightforward as possible. Our replacement cartridges are easy to install, clearly labelled, and matched to the systems we supply. Whether you are maintaining an under-sink reverse osmosis unit, a whole house system, or a countertop filter, we have the right cartridge for the job, delivered to your door when you need it.
The reward for staying on schedule is simple: consistently great tasting, high quality drinking water every single day. That is a result worth protecting, and our team is here to help you do exactly that.
Why Regular Cartridge Replacement Is Essential for Clean Filtered Water
Every water filtration cartridge has a finite capacity. Over time, the filtration media inside the cartridge become saturated with the contaminants it has absorbed or physically blocked by the particles it has captured. Once that happens, the cartridge can no longer do its job properly. In some cases, a fully saturated carbon cartridge can even begin to release previously absorbed contaminants back into your filtered water, which is the opposite of what you want.
Regular replacement of your filter cartridges is the single most important maintenance task for any home water filtration system. It is what keeps your filter systems operating as designed, ensures your flow rate stays consistent, and protects the more expensive components in multi-stage setups, such as the RO membrane, from taking on loads they are not meant to handle.
At Armour Water, we always recommend following the replacement schedule that comes with your system. If you are unsure of your schedule or have misplaced your documentation, please do not hesitate to contact us. Please contact our team, and we will look up your installation records and provide you with the right guidance. Keeping your filtration systems healthy is something we genuinely care about, and we are always happy to help.
Our Range of Replacement Water Filter Cartridges
Sediment Filtration Water Filter Cartridges
Sediment filter cartridges are the first stage in most water filtration systems, removing sand, rust, silt, and suspended particles before water reaches other filters. These replacement water filter cartridges help protect downstream filtration components and maintain strong water flow. Available in multiple micron ratings, they suit different water conditions and are easy to install in standard housing systems.
Carbon Block and Activated Carbon Cartridges
Carbon block and activated carbon filter cartridges remove chlorine, chloramines, VOCs, and chemicals that affect taste and odour in drinking water. These water filtration cartridges use high-quality activated carbon media to absorb contaminants and improve water quality. Carbon block cartridges provide greater contact surface, making them ideal for under sink water filtration systems where cleaner drinking water is essential.
RO Membrane Replacement Cartridges
The RO membrane replacement cartridge is the core component of a reverse osmosis water filtration system. It removes dissolved contaminants including heavy metals, fluoride, nitrates, and PFAS chemicals at a molecular level. While RO membranes last longer than other filter cartridges, they eventually require replacement to maintain filtration performance and ensure consistently high-quality drinking water.
Post-Carbon and Polishing Cartridges
Post-carbon and polishing filter cartridges are the final stage in many water filtration systems. They remove any remaining taste or odour from water stored in the system’s holding tank, ensuring fresh, clean drinking water at the tap. These replacement water filter cartridges help maintain optimal performance and are typically replaced annually as part of regular filter maintenance.
Whole House Filter Cartridges
Whole house filter cartridges treat water at the point it enters your property, filtering the full flow of water used throughout your home. These replacement cartridges for whole house filtration systems remove sediment, chlorine, and other contaminants before water reaches taps and appliances. Available in 20-inch filter housings for Armour Whole Home systems.
The Complete Reverse Osmosis Filter Bundle
Keep your reverse osmosis system performing at its best with everything you need in one convenient bundle. Includes all the replacement filter cartridges required for a full service, matched exactly to your system’s specifications for guaranteed compatibility and performance.
6-Month Bundle
Stage 1 + Stage 2
Keep your pre-filters fresh and your RO membrane protected. Replace every 6 months.
12-Month Bundle
Stage 1 + Stage 2 + Stage 3 + Stage 5
Complete annual service pack covering all filters except the RO membrane. Replace every 12 months.
Full System Bundle
Best Value | All 5 Stages | save $20
Everything your system needs for a complete refresh. Includes the Filmtec RO membrane for full performance restoration.
All bundles include genuine Armour replacement cartridges. Filter intervals are recommended guidelines and may vary depending on your water quality, contaminant levels, and household usage.
How to Know When Your Filter Cartridges Need Replacing
A properly maintained water filtration system depends on replacing filter cartridges at the right time. Every system we install comes with a recommended replacement schedule based on the cartridge type and your household’s daily water usage. Following this schedule ensures your filtered water quality, water pressure, and filtration performance remain consistent.
Over time, replacement water filter cartridges gradually fill with contaminants they remove from your water supply. When cartridges reach their capacity, filtration efficiency can decline. Staying on schedule helps maintain strong water flow and ensures your water filtration system continues delivering clean, safe drinking water.
Regular cartridge replacement also helps extend the life of other components within your filtration system. By keeping your water filter cartridges fresh and operating efficiently, you protect your system while maintaining reliable filtration performance throughout your home.
Drop in Water Pressure or Flow
A noticeable reduction in water pressure from your filtered tap often means a sediment filter cartridge is becoming clogged with particles.
Chlorine Taste or Unpleasant Odour
If chlorine taste or chemical odours return, the carbon filter cartridge may be exhausted and require replacement.
Cloudy or Discoloured Water
Cloudy or unusual coloured water can indicate a water filter cartridge has reached capacity and needs replacing.
Unsure When Filters Were Changed
If you cannot remember your last service, it may be time to replace your replacement water filter cartridges to maintain proper filtration.
The Complete Whole-Home Replacement Filter Bundle
Everything your whole home filtration system needs, bundled into one simple replacement kit. Covers all stages of your system with the correct filter cartridges to maintain peak performance, protect your plumbing, and ensure clean, great-tasting water flows to every tap in your home.
3-Filter Bundle — Self Install
Stage 1 + Stage 2 + Stage 3 | 'Includes a complimentary sediment filter (valued at $40). Everything you need for a full system refresh — easy self-install. Save with a bundle.
3-Filter Bundle + Professional Service
Stage 1 + Stage 2 + Stage 3 + professional installation, system inspection & flush by an Armour installer * | 'Includes a complimentary sediment filter (valued at $40). Save with a bundle.
All bundles include genuine Armour replacement cartridges. Filter intervals are recommended guidelines and may vary depending on your water quality, contaminant levels, and household usage.
Genuine Replacement Cartridges for All Major Filter Systems
At Armour Water, we stock genuine and compatible filter cartridges for all the systems we supply. For compatibility queries on non-Armour systems, please contact our team before ordering. Whether your system is an under-sink RO unit, a whole house setup, or a countertop filter, we carry the cartridges you need.
We are committed to stocking only high quality cartridges from trusted manufacturers. Our replacement cartridges are independently tested to confirm they meet the performance claims on the label. We do not cut corners on product quality because we know that the entire value of your filtration systems investment depends on having reliable, effective cartridges doing their job every day.
We also offer a convenient subscription and reminder service for our customers. Register your system with us and we will send you a reminder when your next filter cartridges change is due, with the option to have your cartridges delivered automatically so you are never caught without a fresh supply. It is the simplest way to stay on top of maintenance and keep your great tasting, quality water flowing without interruption.
Professional service, clear advice, and a filtration system that delivers consistent results. A smart upgrade for any household concerned about water quality.
Frequently Asked Questions About Water Filter Cartridges
The replacement frequency for filter cartridges depends on the type of cartridge, the system it is used in, and your household's daily water consumption. As a general guide, sediment cartridges in a whole house or under-sink system typically need changing every six months. GAC every 6 months, carbon block and post-filter every 12 months. RO membranes generally last two to four years, while post-carbon polishing cartridges are typically changed annually.
If your home is on a well water, tank, or heavily sediment-laden water supply, your pre-filter cartridges may need to be replaced more frequently than the standard schedule suggests. Usage volume also plays a role: a household of five or six people will exhaust the cartridge's capacity faster than a single-person household using the same water filtration system. The best approach is to follow the schedule provided with your system and monitor for the early signs of cartridge exhaustion, such as reduced flow, changes in taste, or odour returning to your filtered water. If you are ever unsure, please contact our team for personalised advice tailored to your specific setup and water source.
Yes, many of our replacement water filter cartridges are compatible with the standard housing sizes and thread configurations used by the most popular residential filter brands in Australia. Our whole-home system uses 20" x 4.5" Big Blue-format cartridges. Standard 10" cartridges are not compatible with this system. Standard O-ring and thread fittings are compatible with a wide range of housings from different manufacturers, making it straightforward to source replacement cartridges without being locked into a single supplier.
That said, some proprietary systems use non-standard cartridge formats that require brand-specific replacements. If you are unsure whether a particular cartridge will fit your housing, the safest approach is to bring in your existing cartridge or check the model number on your system, and please contact our team before ordering. We would rather take five minutes to confirm compatibility than have you receive a cartridge that does not fit. We stock a wide range of filter cartridges and can almost always find a compatible option. Our goal is to make it as simple and affordable as possible to maintain your filtration systems, regardless of the brand you originally purchased.
Neglecting timely filter cartridge replacements can have a direct and measurable impact on your water filtration system's performance and the safety of your water supply. The first signs are typically a reduction in water pressure and flow rate, caused by blocked sediment cartridges restricting the passage of water through the system. Sediment cartridges should be replaced every 6 months, although this may vary depending on your water quality, contaminant levels, and household usage. When the carbon stage becomes overdue, drinking water can begin to taste and smell of chlorine once more — a telling sign that the carbon media has reached its absorption limit. Of greater concern is the risk of carbon breakthrough, where a fully exhausted carbon block cartridge begins releasing previously trapped contaminants back into your water, potentially resulting in filtered water that carries higher contaminant levels than untreated tap water.
Beyond affecting water quality, overdue pre-filter cartridges place unnecessary strain on downstream components, particularly RO membranes, forcing them to operate well beyond their intended design limits and accelerating wear. Under normal conditions, RO membranes last between two to four years depending on water quality and household usage — however, consistently delayed filter cartridge replacements can significantly shorten this lifespan and lead to costly repairs or premature system failure. Staying on top of your filter cartridge replacement schedule is the single most cost-effective measure you can take to safeguard your investment, extend the life of your entire water filtration system, and ensure your household always has access to clean, safe water.
Identifying the correct replacement water filter cartridges for your system is straightforward. The easiest place to start is the model number printed on your existing cartridge housing or in the documentation provided at installation. Most housings have the recommended cartridge size and media type clearly labelled, and your owner's manual will outline the full specifications along with the manufacturer's recommended service schedule. As a general guide, sediment cartridges should be replaced every 6 months, though this may vary depending on your water quality, contaminant levels, and household usage.
If your system was installed by Armour Water, we make the process even simpler. We maintain detailed records of every installation we have completed, including the system model, cartridge specifications, and recommended service intervals. Simply contact our team with your name and address, and we can pull up your installation details and confirm exactly which filter cartridges you need. We can also advise whether upgrading to a higher performance cartridge would benefit your setup — for example, moving from a standard sediment cartridge to a dual-gradient cartridge for improved particle capture and a longer service life. Our team is always happy to help you get the most out of your water filtration system and talk through whichever options best suit your household's needs.
In most cases, changing replacement water filter cartridges in a standard under-sink or whole house system is a straightforward task that a confident homeowner can handle without any specialist skills. Most modern filter systems use twist lock or snap-in cartridge housings that are designed to be easy to install and change out at home. The process typically involves shutting off the water supply to the system, unscrewing the filter housing, removing the old cartridge, inserting the new one, and refitting the housing. A basic filter housing wrench, usually included with the system, is the only tool needed.
We include clear, illustrated change-out instructions with all our filter cartridges so you always have step-by-step guidance on hand. For customers who prefer not to do it themselves, or for systems with more complex configurations such as multi-stage RO units with multiple housings, we offer a professional cartridge replacement service. Our technicians can visit your home, replace all cartridges, flush the system, and confirm that everything is functioning correctly in a single visit. This is the easy to install experience taken one step further: zero effort on your part and complete confidence that your high quality drinking water is back to its best. Either way, we are here to support you in keeping your water filtration system in top condition.