Pool Filter Replacement Guide

Your pool filter plays a crucial role in keeping the water in your swimming pool clean, clear and safe to swim in. It's not just about how the water looks - a properly working filter system helps remove dirt, oils, debris and bacteria that can build up over time.

Replacing worn-out parts like the filter cartridge or filter media is essential as part of your regular pool maintenance routine. Over time, these components lose efficiency, making it harder for the pool's filtration system to do its job. You might start noticing cloudy water, sluggish circulation or even an increase in your energy bills as your pump works harder to compensate.

Ignoring a tired pool filter can also put unnecessary strain on the entire filter system, leading to bigger and more expensive problems down the track. A timely replacement keeps your pool healthy and your maintenance stress-free - just as it should be.

Understanding the Basics of Pool Filtration

Keeping pool water clean starts with a good filtration system. Here's how it all works in simple terms.

How Filtration Works

Pool water is drawn into the filtration system through skimmers and drains and pushed through the pool filter. This is where dirt, oil, fine particles, and even stray leaves get trapped. Clean water flows back into the pool through return jets, giving it that fresh, clear look.

Core Components

The system consists of a filter tank, filter housing, and often a multiport valve that controls different settings, such as backwashing or rinsing. Inside the housing, pool filter cartridges do the heavy lifting. Over time, an old filter cartridge can get clogged and lose effectiveness, making the water harder to keep clean.

Cartridge Care and Replacement

When it's time to change, use quality replacement filter cartridges suited to your system. Swapping out an old filter cartridge for a new filter improves flow and keeps your pool water in top shape. Make sure the filter cartridge fits your model to avoid damage or poor performance.

Regularly replacing pool filter cartridges is a simple way to keep your pool safe, clean and easy to maintain.

The Main Types of Pool Filters Explained

Choosing the right pool filter depends on your setup, pool size, and the effort you want to put into cleaning. Here's a simple look at the three main types.

1. Cartridge Pool Filters

Cartridge filters are a popular pick for smaller to medium-sized pools. They're easy to clean and work well with most standard pool pumps.

• Found in a filter housing connected to the pool equipment
• Use a filter cartridge that traps debris
• A cartridge pool filter doesn't require backwashing
• Suits pools without heavy leaf loads
• Replace the pool cartridge filter every year or as needed

2. Sand Filters

Sand filters are common thanks to their lower upfront cost and simple design. They use pool filter sand to trap particles as water flows through.

• Ideal for medium to large pools
• Water is cleaned through sand filter media
• Requires backwashing to flush out trapped dirt
• Replace sand every 5 years
• Often used with robust pool equipment

3. DE Filters (Diatomaceous Earth)

DE filters offer the finest filtration, capturing even the smallest particles. They use a fine powder called diatomaceous earth.

• Water passes through DE filter grids coated in powder
• Requires frequent cleaning
• Add diatomaceous earth after each backwash
• It requires more upkeep, but it is excellent for crystal-clear water
• Usually paired with larger filter housing systems

When to Replace the Entire Filter Unit vs Just the Cartridge

Not all pool filter issues require a complete system replacement. Sometimes, a simple cartridge swap will do the trick. Here's how to tell the difference.

Replace the filter cartridge if:

• You're seeing reduced flow and need a new filter cartridge
• The filtration system runs, but there's mild, cloudy water
• The pressure gauge shows higher than normal pressure
• You're following the manufacturer's instructions for routine changes
• You want to restore crystal-clear water without major work

Replace the entire filter unit if:

• The filter housing is cracked or leaking
• The filter tank is warped or brittle from sun damage
• DE filters show rust or broken DE filter grids
• The multiport valve is faulty or stuck in one position
• Water pressure remains low despite a new cartridge
• Your pool system is older and struggles to keep the pool clean
• You want to upgrade to a better filter type for efficiency

Choosing the Right Replacement Filter

Getting the right replacement filter for your pool system can save you time, money, and hassle. The best choice depends on your pool size, how often it's used, and the filtration setup you already have.

Things to consider:

• Pool size and usage: A small backyard pool won't need the same filter capacity as a heavily used or larger pool. Choose something that suits your daily use without going overboard.
• Plumbing and pump compatibility: Make sure your filter matches the flow rate of your existing pool pump. Oversized filters can cause pressure issues, while undersized ones won't clean properly.
• Filter type: If your setup uses a cartridge pool filter, stick to a compatible filter cartridge that fits your model. Ensure your replacement supports DE filter grids and proper backwashing for those with DE filters.
• Brand and parts availability: Choose a trusted brand with good support and easy access to replacement filter cartridges or parts.

A well-matched filter keeps your pool running smoothly and water quality clean with less effort - and fewer surprises.

Maintenance Tips to Extend Filter Life

As swimming pool owners, keeping your pool filter in top shape doesn't need to be a hassle. With some simple routine maintenance, you can extend the life of your system and keep your water clean all season long.

Try these practical maintenance tips:

• Rinse cartridge filters with a garden hose every 2 to 4 weeks to remove small particles and debris.
• Backwash sand and DE filters when the filter glass or sight glass shows cloudy discharge.
• After each backwash with DE filters, always add fresh diatomaceous earth to maintain effective filter media coverage.
• Avoid over-chlorination, which can break down filter media and lead to clogs or an algae bloom.
• Check the multiport valve, pressure gauge and air release valve regularly to spot pressure issues early.
• Store spare filter cartridges in a dry, shaded area and keep all the necessary tools for quick swaps nearby.
• Open the drain plug on the filter tank during deep cleaning to flush out built-up grime.
• Make sure plumbing connections are secure during every inspection or installation process.

With regular maintenance, the right filter will perform better, last longer and help avoid costly repairs down the track.

Common Mistakes to Avoid

A few small slip-ups can lead to bigger problems in your pool system. Here are some common mistakes to watch out for:

• Running the filter dry, which can damage internal parts
• Installing the wrong size filter cartridge leads to poor performance
• Skipping regular cleaning, especially with a cartridge pool filter
• Forgetting to bleed air from the tank after opening it, which can affect pressure
• Adding too much diatomaceous earth - DE filters only need the recommended amount

Avoiding these errors helps your filter run smoothly and keeps your pool water in great shape.

Why Professional Help Can Make a Big Difference

Sometimes, a DIY fix just won't cut it. If your pool or spa water still looks off after basic maintenance, it might be time to call a professional.

A pool expert can help with:

• Diagnosing issues like poor circulation or cloudy spa remains
• Replacing cracked filter tanks or damaged housing that can't be fixed with duct tape
• Handling full system upgrades, especially when switching filter types or installing new valves
• Ensuring a watertight seal and checking all plumbing connections are functioning correctly

Incorrect setup or using the wrong amount of de powder or diatomaceous earth can lead to more problems. A professional ensures everything runs optimally, helping you save money over time.

Many experts also offer extensive filter options and advice tailored to your specific pool setup. This is a smart move when the job needs more than a basic clean.

Let Your Pool Breathe Easy Again with the Right Filter Setup

Your pool filter does more than just clean - it keeps your water safe, balanced and ready to enjoy. Staying on top of maintenance and knowing when to replace key parts can save you time, water and money in the long run.

Don't let cloudy or dirty water ruin a perfect swim day. The correct filter setup makes all the difference.

At Flamingo Pools, we specialise in pool filtration systems, from cartridge filter swaps to full filter tank replacements. If you're unsure what your pool needs, contact us today - we're here to help you swim easily.