Hot Tub Advice

How to clean a hot tub filter: Essential filter cleaning tips

How to clean a hot tub filter: Essential filter cleaning tips
Maintenance guide

Short answer: rinse filters weekly, deep-soak quarterly, and replace every 6–12 months (we recommend every 6 months for peak performance). Keeping filters clean prevents low-flow errors, murky water, and strain on pumps/heaters.

Whether you’re new to hot tub ownership or you’ve years of experience, keeping your hot tub or swim spa clean is essential to good hot tub maintenance.

The filter is the frontline for clean water. If you don’t look after or replace filters when needed, water can turn green, foamy, or gritty — and the system can suffer.

Good news: learning how to clean a hot tub filter is simple and quick, so you spend more time soaking and less time troubleshooting water issues.

Below we cover what filters do, why cleaning matters, how often to clean, weekly vs quarterly methods, and how to extend filter life — with FAQs at the end.

What is a hot tub filter?

A hot tub filter removes organic particulates, bacteria, and dust to maintain water clarity. Water circulates through pleated fibres that capture debris — keeping water clear and fresh as it moves through the pipework.

Why is cleaning a hot tub filter important?

Clean filters = clean water + efficient systems. Dirty filters lead to algae/biofilm, “low-flow” errors, slower heating, weaker jets, and pump strain.

Watch for these symptoms

Cloudy or green tint Foam build-up Low-flow warnings Slower heat times Weaker jet pressure

How to tell if a hot tub filter is working?

Use the tub regularly and monitor clarity. If water stays clear over a couple of weeks with typical usage, filtration is doing its job.

How long do hot tub filters last?

Quality filters can last up to 12 months, but for best performance we recommend replacing every 6 months (more often with heavy use or hard water).

What is the best way to clean a hot tub filter?

Here are the methods we recommend depending on cadence.

Weekly hot tub filter cleaning

  1. Power off the tub.
  2. Remove filters and rinse thoroughly (hose or bucket). Spread pleats to dislodge hair/debris.
  3. Spray with a rapid filter cleaner; leave for the product’s contact time.
  4. Rinse again and let the filter dry fully before reinstalling.

Quarterly hot tub filter cleaning (deep soak)

  1. Ideally align with a drain/refill cycle.
  2. Soak filters overnight in a filter-cleaning solution (dilute per label; keep fully submerged).
  3. Rinse thoroughly the next day and let dry completely before reinstalling.

Recommended cleaning schedule

Frequency Action Why it matters
Every week Rinse + spray Removes surface debris/oils
Every 3 months Overnight chemical soak Breaks down embedded grime/biofilm
Every 6 months Replace filter Maintains top-tier flow & clarity

Shop essentials

How often should I clean my filters?

Follow the schedule above and adjust based on usage. Heavy use clogs faster. After first fill (or any drain/refill), filters may clog within 3–4 days — that’s normal as tap water and manufacturing particles get captured.

How can I make my hot tub filters last longer?

  • Maintain balanced water chemistry — makes filtration easier.
  • Rinse off lotions/products before soaking.
  • Rotate between two+ filter sets quarterly to reduce wear and avoid downtime.

Find the right hot tub filter in our range

Now you know how to clean and when to replace filters. For replacements and care kits, explore our hot tub accessory range. If you’re shopping tubs, see our latest hot tubs, swim spas, and ice baths, and browse our inspiration blog for more guides.

Ready for crystal-clear water with less effort?

Grab the right filter and cleaner kit today — or ask our team to match the exact cartridge for your model.

Hot tub filter cleaning FAQs

Why do I need to let my filter dry completely before putting it back?
Drying lets pleated fibres reset, improving effectiveness when reinstalled.
Can I clean my hot tub filters with bleach?
No. Bleach can corrode fibres and fixtures, damaging the filter.
Can I clean my hot tub filters with detergent?
It’s possible but not ideal. Dedicated filter cleaners are more effective; detergent may leave residues.
Can I clean my hot tub filters with vinegar?
Not recommended. Some vinegars are too acidic and can damage fibres.
Can I run my hot tub without a filter?
Never. Debris will enter pipework, causing blockages and system damage.
Need the right replacement filter?
We’ll match the exact cartridge for your model.

Ready for cleaner water and lower maintenance?

Choose an energy-efficient hot tub and pair it with the right filter and cover kit for year-round clarity.

Reading next

Things to know before buying a hot tub
How to prepare your hot tub for winter

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