How To Clean Pool Cartridge Filter Elements: A Five Step Guide
Cartridge filters are a popular choice, they’re simple to use, energy efficient, and provide excellent filtration. Like all filter systems, however, they need regular maintenance to keep your pool water clean, clear, and healthy. One of the most important tasks is cleaning the cartridge elements.
In this article, we’ll focus on cartridge filters with single elements as multi-cartridge filters are more complex and usually do not require cleaning as often.
We will explain how often you should clean your pool cartridge filters, the signs that it’s time for a clean, why soaking the elements is necessary and give you some tips for extending the life of your cartridge filter element.
This is a general guide only, as every pool and equipment system is unique and we can’t tailor advice to every specific set up. It is best to ask us if you are unsure or your system differs from what we have outlined here.
How Often Should You Clean Cartridge Elements?
For the average residential pool, cartridge elements should be cleaned every 4–6 weeks during the swimming season. However, this can vary depending on factors such as:
- Cartridge Size-Filters are measured in square feet of surface and the size will affect how often it needs cleaning. The smaller the relative size the more often it needs cleaning.
- Pool usage – Heavy swimmer loads or frequent pool parties can clog cartridges more quickly.
- Environmental factors – Leaves, dust, pollen, and nearby construction can all increase debris in your pool.
- Water balance – Poorly balanced water can encourage scale build-up, which clogs cartridges faster.
As a general rule, aim to clean them when the filter pressure rises 20kpa above the clean starting pressure, or when you notice reduced water flow. If you don’t know the pressure when the element was first installed, use the pressure you achieve after a thorough ‘deep’ clean.
Indicators That It’s Time to Clean
You don’t always need to wait for a set number of weeks, your filter will often tell you when it needs attention. Watch for these signs:
- Higher-than-normal pressure on the gauge (usually 20kpa over the normal “clean” reading).
- Reduced water flow through chlorinator electrode or at the return line back into the pool.
- Cloudy or dull-looking water despite correct chemical levels.
How to Clean Cartridge Elements
- Turn off the pump and open the air bleed valve on the top to relieve pressure in the filter system.
- Remove the cartridge element from the housing.
- Rinse with a garden hose, using a strong jet type nozzle, to remove loose dirt and debris. Spray between each pleat at a downward 45° angle for best results.
- Inspect the cartridge for damage such as torn pleats, broken bands, or cracks in the end caps. If damaged, it should be replaced rather than cleaned.
- Check for built up grime inside the pleats andmake a special effort to remove as much as possible using the spray nozzle.
Why and How to Soak Cartridge Elements
A simple hose-down removes surface debris, but oils, sunscreen, and fine particles can cling deep in the filter material. Over time, these residues block water flow and reduce filtration efficiency.
When to Soak
Cartridge elements should be soaked every 2–3 months, or more often if your pool gets heavy use. If you notice greasy buildup, persistent cloudiness, or the pressure increases above 20kpa soon after rinsing, it’s a sign that a soak is needed.
- Use a specially formulated cartridge cleaning solution (not household cleaners, which contain unwanted chemicals and can damage the filter media).
- Mix the solution in a large bucket or tub according to the instructions.
- Submerge the cartridge (according to the product instructions) to dissolve oils, sunscreen, body fats, and scale.
- Rinse thoroughly with fresh water with the jet nozzle before reinstalling.
Tips for Longer Cartridge Life
- Avoid using a pressure washer as the high force can damage and tear the pleats.
- Rotate between two sets of cartridges if possible, allowing one to dry completely after soaking.
- Replace cartridges every 2–3 years (or sooner) if you are in a bad environment. Even well-maintained elements lose efficiency over time. Signs you need new cartridges include:
- Cloudy water persists after cartridge cleaning.
- If the pressure remains 30-40kpa above starting pressure from when element is new or from the lowest pressure you achieve after a deep clean.
- If damaged, eg: pleats are no longer straight or pleat band is torn or frayed.
Final Word
Regular cleaning of your pool filter cartridges is essential to keep your water crystal clear and your pool system running efficiently. By rinsing them every few weeks and giving them a deep soak every couple of months, you’ll extend the life of your cartridges and ensure the best possible water quality.
If you are concerned about your cartridge element either bring it in or perhaps bring some photos and we can advise you if it needs changing.
Its always good to note the make and model of the filter when enquiring about replacement element otherwise we can measure the element in store and find a suitable replacement.
