If you own a pool in Melbourne, your filter is doing more work than you probably give it credit for. It runs for hours every day, pulling debris, bacteria, and fine particles out of the water so your pool stays clean, clear, and safe to swim in. But not all filters are maintained the same way — and the type of filter you have has a direct impact on how much ongoing effort your pool demands from you.
The two most common residential pool filter types in Australia are sand filters and cartridge filters. Both do the same job, but they clean, maintain, and wear out differently. If you’re weighing up which is less work to own, or trying to understand what your current filter actually needs, this guide breaks it all down.
How Each Filter Works?
Before comparing the maintenance load, it helps to understand what’s happening inside each filter type.
Sand filters push pool water through a tank filled with specially graded silica sand (or sometimes glass media). Contaminants get trapped between the sand particles as water passes through, and clean water exits back into the pool. Over time, the trapped debris actually improves filtration — up to a point — before pressure builds and the filter needs to be cleaned.
Cartridge filters use a pleated polyester or fibreglass element — similar in appearance to a car’s air filter — to physically trap debris as water passes through. The large surface area of the pleated material captures fine particles without requiring high water pressure to push water through. When the cartridge becomes clogged, it’s removed, rinsed, and either reinserted or replaced.
Both systems rely on your pool pump to push water through the filter. Poor pump performance directly reduces filtration efficiency regardless of which filter type you use.
Cleaning a Sand Filter: What’s Involved
Backwashing
The primary cleaning method for a sand filter is backwashing — reversing the flow of water through the filter to flush trapped debris out through a waste line. It’s a straightforward process:
- Turn off the pump
- Set the multiport valve to “Backwash”
- Run the pump for 2–3 minutes until the sight glass runs clear
- Switch to “Rinse” and run for 30 seconds to resettle the sand bed
- Return the valve to “Filter” and resume normal operation
The whole process takes around 5 minutes and uses roughly 200–500 litres of water, depending on your filter size. You don’t need to open the filter or physically handle any media.
How Often Does a Sand Filter Need Backwashing?
Most sand filters need backwashing every 4–6 weeks under normal conditions, or whenever the filter pressure gauge reads 7–10 psi above its clean starting pressure. During high-use periods, periods of heavy rain, or after a storm, you may need to backwash more frequently.
A key thing to note: sand filters should not be backwashed too often. A modest amount of debris in the sand actually improves its ability to catch fine particles. Over-backwashing removes this and reduces filtration efficiency. Our guide on how long to run your pool pump each day helps with understanding when your filter is working at its best.
Sand and Media Replacement
Sand doesn’t last forever. Over 3–5 years, the sand grains become rounded through wear, reducing their ability to trap fine particles. You’ll notice your water staying slightly hazy despite good chemistry, or the filter requiring increasingly frequent backwashing. When that happens, the sand needs to be replaced entirely — a job that involves opening the filter, scooping out the old sand, and refilling with fresh media.
This is typically a once-every-few-years job rather than routine maintenance, but it is an additional layer of work sand filter owners need to plan for. Our sand and filter change service in Melbourne handles this if you’d prefer not to tackle it yourself.
Deep Cleaning
Periodically — roughly once a year — sand filters benefit from a chemical treatment to dissolve oils, sunscreen residue, and mineral deposits that backwashing doesn’t remove. This involves adding a filter cleaner to the system and letting it soak before a final backwash. It’s not labour-intensive, but it is an extra step that cartridge filter owners handle differently.
Cleaning a Cartridge Filter: What’s Involved
Hosing Down the Cartridge
Cartridge filters are cleaned by physically removing the cartridge element and spraying it down with a garden hose. You work from top to bottom at an angle, rinsing debris out from between the pleats. There’s no backwashing, no multiport valve, and no water goes to waste via a drain line.
The process takes around 10–15 minutes per cartridge (some filter housings contain two or more cartridges), and requires you to:
- Turn off the pump and release pressure via the air relief valve
- Open the filter housing and remove the cartridge(s)
- Rinse thoroughly with a hose — never a pressure washer, which damages the pleats
- Inspect for tears, cracking, or flattened pleats
- Reassemble and restart
How Often Does a Cartridge Filter Need Cleaning?
More often than a sand filter. Most cartridge filters need cleaning every 4–8 weeks, but in heavy-use conditions, near trees, or during algae season, monthly cleaning is common. Unlike a sand filter, there’s no risk of over-cleaning — the more often you rinse it, the better.
This higher cleaning frequency is the main reason cartridge filters are considered more hands-on. Each clean requires opening the filter housing and physically handling the cartridge, whereas a sand filter backwash is done with a valve turn.
Chemical Soaking
Every few cleans — roughly every 3–6 months — cartridge elements benefit from an overnight soak in a filter cleaning solution. This dissolves oils, calcium deposits, and sunscreen residue that hosing alone doesn’t remove. The cartridge sits in a bucket of diluted solution overnight, then gets a final rinse before being reinstalled.
This is a more involved process than the equivalent step for sand filters, but it significantly extends cartridge life. Skipping it leads to premature cartridge failure.
Cartridge Replacement
Cartridges typically last 2–3 years with proper maintenance, though this varies considerably based on pool size, bather load, and how well they’re looked after. When the pleats start to collapse, crack, or can no longer be cleaned back to good flow, the cartridge needs to be replaced.
Replacement cartridges are a consumable cost sand filter owners don’t face. However, they’re generally cheaper than a full sand media replacement, and the job is simpler — just swap the element. Our pool filter cleaning service in Melbourne covers both filter types and includes a condition assessment so you know where your filter stands.
Head-to-Head: Maintenance Comparison
| Factor | Sand Filter | Cartridge Filter |
| Primary cleaning method | Backwash (valve-operated) | Manual rinse (physical removal) |
| Cleaning frequency | Every 4–6 weeks | Every 4–8 weeks (often monthly) |
| Time per clean | ~5 minutes | ~10–20 minutes |
| Physical handling required | No | Yes |
| Water used per clean | 200–500 litres | Negligible |
| Deep cleaning | Annual chemical treatment | Every 3–6 months soak |
| Media/element replacement | Every 3–5 years (sand) | Every 2–3 years (cartridge) |
| Filtration of very fine particles | Moderate | Better |
| Ease of cleaning | Easier | More involved |
Which Filter Takes More Work?
Honestly, cartridge filters require more regular physical effort, while sand filters are lower maintenance between cleans but involve more water use and occasional media replacement.
For pool owners who want the least hands-on involvement, a sand filter’s backwash process is simpler and faster. You don’t need to open anything or handle wet filter media. The trade-off is that each backwash uses a meaningful amount of water, and you’ll need to top up your pool after every cleaning cycle.
For pool owners who want better fine-particle filtration, lower ongoing water use, and are happy to put in a bit more effort every few weeks, a cartridge filter delivers cleaner water and is more water-efficient overall — an important consideration in a city like Melbourne where water restrictions apply.
It’s also worth noting that both filter types still require good water chemistry to function properly. A filter running in chemically unbalanced water will clog faster, work harder, and wear out sooner. Our pool chemical balancing service in Melbourne ensures your water parameters are supporting — not undermining — your filter’s performance. For a broader look at what’s involved in pool filter maintenance and when to consider repairing vs replacing your filter, those guides are worth reading alongside this one.
Signs Either Filter Type Needs Attention
Regardless of which filter you have, these signs point to a filter that needs cleaning or servicing:
- Cloudy or hazy water despite balanced chemistry — the filter isn’t catching fine particles
- Rising pressure on the gauge — 7–10 psi above baseline means it’s time to clean
- Reduced return jets — low flow through the returns suggests a blocked filter
- Green or algae-tinged water — often a sign of both chemical and filtration issues working together. Our green pool recovery service addresses both simultaneously
If your pressure gauge is reading high but the filter still isn’t clearing the water after cleaning, the sand or cartridge itself may be past its useful life and need replacing. Our pool equipment repairs service can assess whether a clean, a media change, or a full filter replacement is the right call.
Pressure Problems Are Often Pump Problems Too
One thing pool owners sometimes overlook: poor filtration isn’t always the filter’s fault. If your pool pump is losing pressure, running inefficiently, or not circulating water at the right flow rate, even a clean filter won’t perform well.
If you’re dealing with pool pump pressure problems or the pump itself is making unusual noises or running intermittently, getting the pump checked alongside the filter is the most efficient approach. The two components work as a system.
For a complete view of what filter selection, water flow, and pump sizing mean for your specific pool, our pool maintenance service in Melbourne covers the full picture — including a check of all equipment to make sure everything is working together efficiently.
Conclusion
Both sand and cartridge filters are capable of keeping your pool clean when maintained properly. Sand filters win on ease and speed of routine cleaning. Cartridge filters win on water efficiency and fine-particle filtration, but demand more hands-on time.
The filter that takes less work in practice is usually the one that suits your pool size, usage patterns, and maintenance habits. If you’re unsure which system is right for your situation, or if your current filter is struggling to keep up, our team offers pool equipment installation and advice across all major filter brands and types.
Whichever filter you run, staying on top of cleaning frequency is far less work than dealing with a cloudy pool, an algae outbreak, or a filter pressure problem down the line.
