How Often Should You Change Your Inflatable Hot Tub Filter?

If you’ve ever peered into your inflatable spa and thought, “Hmm, this water doesn’t look as inviting as it did yesterday,” chances are your filter’s waving a little white flag.

Short answer: most inflatable hot tub filters need cleaning weekly and replacing every 4–12 months, depending on use.

The longer answer? Well, a filter’s life isn’t one-size-fits-all. It depends on how often you use your spa, how many people climb in, your water quality, and how well you look after it. Stick with me, and by the end of this guide you’ll know not only when to swap your filter, but also how to keep it going for as long as possible.

The Three Key Factors That Determine Filter Lifespan

Usage Frequency and Bather Load

The difference between light, moderate, and heavy use

If you only use your hot tub occasionally—say, once a week for a quick unwind—the filter will last far longer than if it’s bubbling away daily. Think of it like washing clothes: the more often you wear them, the more quickly they wear out.

How many people using the tub affects the filter

A family of four splashing around every evening will clog a filter faster than one person soaking alone. Oils, dirt, and yes—bits of sun cream—all end up in the water and straight into the filter.

The impact of showering before use

Here’s a pro tip: a quick shower before hopping in makes a big difference. Less body oil, moisturiser, or deodorant entering the water means less strain on your filter.

Water Quality and Chemistry

How hard water affects your filter

If you live in a hard-water area, you’ll know the pain of limescale in kettles. The same goes for your hot tub filter. Mineral build-up can shorten its life dramatically.

The role of pH and alkalinity

Keep your pH and alkalinity balanced, and your filter will thank you. If the water goes out of whack, you’ll not only feel it on your skin, but your filter will get clogged faster.

The importance of sanitizers (chlorine/bromine)

Without chlorine or bromine, bacteria and algae quickly take over, meaning your filter has to work overtime. Proper chemical balance keeps both your water and filter in top condition.

Filter Maintenance and Quality

The difference between cleaning and replacing the filter

Cleaning extends a filter’s life, but it doesn’t last forever. Think of it like hoover bags: you can shake them out a few times, but eventually, you’ll need a new one.

The benefits of having a spare filter

Having a second filter is a game-changer. Pop one in while the other’s drying after a deep clean—it keeps your spa running smoothly without downtime.

How to identify a high-quality filter

Not all filters are created equal. Look for strong pleats and durable material rather than flimsy ones that collapse after a few weeks.

Signs It's Time to Change Your Inflatable Hot Tub Filter

Visual and Physical Cues

Visible damage (tears, fraying, broken pleats)

If your filter looks shredded or the pleats are falling apart, it’s beyond saving. Time to replace.

Discolouration or staining that won’t wash off

A bit of dirt is normal, but if the filter stays brown or grey after a good rinse, it’s reached the end of its life.

The filter feels "worn out" or is difficult to clean

Filters get “tired.” If it feels limp, spongey, or simply impossible to clean properly, swap it out.

Performance Indicators

Reduced water flow or weaker jets

Clogged filters stop water from flowing freely. If your jets feel weak, don’t blame the pump—check the filter first.

Cloudy, foamy, or dirty water despite proper chemical levels

If your water chemistry is fine but the water still looks murky, your filter may not be doing its job anymore.

The pump making unusual noises (e.g., a "deeper" sound)

A struggling pump can sometimes be a filter crying for help. Don’t ignore new sounds.

Frequent error codes (e.g., E90)

Many inflatable hot tubs throw up error codes like E90 when the filter’s clogged. If you see one, check your manual—but chances are, it’s filter-related.

How to Maximize the Life of Your Hot Tub Filter

The Weekly Rinse

Rinse the filter under running water at least once a week to remove dirt and oils.

The Monthly Deep Clean

Soak it in a specialist filter-cleaning solution to get rid of deeper grime.

Essential Hot Tub Maintenance Routine

Check your water chemistry regularly, use sanitiser correctly, and don’t forget to wipe down your spa’s surfaces. Good habits save filters.

Frequently Asked Questions

Can I reuse my hot tub filter?

Yes—with regular cleaning. But don’t expect it to last forever.

How long does a hot tub filter last on average?

Anywhere from 4–12 months, depending on use and care.

Can I clean my filter in the washing machine?

Nope. The heat and spinning will destroy it. Stick to rinsing and soaking.

Do I need to run the filter when the hot tub isn’t in use?

Yes, at least part of the day. It keeps water circulating and prevents stagnation.

What is a "filter sock" and do I need one?

It’s a mesh cover that goes over your filter to catch bigger debris. Not essential, but handy if you want to reduce cleaning frequency.

Final Thoughts

Changing your inflatable hot tub filter isn’t glamorous, but it’s the secret to clear, safe water and a spa that lasts. Clean it weekly, deep clean monthly, and replace it when the signs show. Do that, and you’ll spend less time scrubbing and more time soaking.