How to Clean and Replace Hot Tub Filters Properly

Your hot tub filter does more work than most owners realize. Every time the pump runs, water passes through a pleated synthetic cartridge that traps bacteria, body oils, lotions, dead skin cells and debris down to around 20 microns in size. This filtration keeps your water clear, your jets performing properly and your sanitizer working efficiently.

When the filter becomes dirty, everything downstream suffers. Water turns cloudy, jet pressure drops and your sanitizer has to work harder, increasing chemical costs. Over time, a clogged filter can even strain the pump motor, which causes an expensive repair that is often completely preventable.

Knowing how to clean a hot tub filter properly and when to replace it is one of the most valuable maintenance habits a spa owner can develop. This guide covers the complete routine. 

How Often Should You Clean Your Hot Tub Filter?

Cleaning your spa filter prevents buildup from affecting water quality and equipment performance. A typical maintenance schedule looks like this:

• Weekly: Rinse away loose debris such as leaves, bugs and recent body oils. This takes only a few minutes.
• Monthly: Perform a deeper chemical soak to remove oils, scale and contaminants that water alone cannot eliminate.
• Every 12-24 months: Replace the filter cartridge depending on usage, water chemistry and overall condition.

Heavy spa use, frequent bathers or hard water conditions may require more frequent cleaning. Remove the filter and hold it toward a light source. If you cannot see clearly through the pleats, it is time for a deeper clean.

How to Remove the Filter from Your Hot Tub

Before removing your filter, always turn off the spa power at the control panel or breaker. Never remove a filter while the pump is running. The exact removal process depends on the spa model. On many systems, the filter housing is located near the footwell or skimmer basket. Twist the filter counterclockwise and lift it out.

On Hot Spring® Highlife models with Tri-X® filters, remove the lid and pull the filter straight up. If your spa includes an EcoPur® mineral cartridge inside the housing, remove it separately because it requires different care.

Before cleaning, inspect the filter pleats, end caps and internal core. This will help determine whether the cartridge can be restored or needs replacement.

The Best Way to Clean Hot Tub Filters: Step by Step

The most effective cleaning routine combines regular rinsing with monthly deep soaking. Here’s how to clean hot tub filters correctly from start to finish:

Step 1: Turn off the power and remove the filter

Always disconnect power before opening the filter housing. This prevents water flow issues and protects the equipment. 

Step 2: Rinse at a 45-degree angle

Use a garden hose with a spray nozzle set to a firm, but gentle stream. Hold the filter horizontally and spray downward between each pleat while rotating the cartridge. This pushes debris out of the folds instead of forcing it deeper inside. Avoid pressure washers because the high pressure can damage the filter fabric and reduce filtration performance.

Step 3: Soak in a dedicated filter cleaner solution (monthly)

A hose removes surface debris, but it cannot break down oils, lotions and organic buildup. For monthly cleaning, use a dedicated hot tub filter cleaner solution. Follow the product instructions, fully submerge the cartridge in a large bucket and allow it to soak for at least 12 hours, ideally overnight.

Step 4: Rinse thoroughly

After soaking, rinse the filter until the water running through the pleats is completely clear. Leftover cleaner can create excessive foam when the filter is placed back into the spa.

Step 5: Air dry completely before reinstalling

Letting the filter dry fully helps restore the synthetic fibers and reduces the chance of bacteria remaining inside the cartridge. This is one reason many spa owners use a two-filter rotation system.

Cleaning Spa Filters: What About Vinegar or Dawn Dish Soap?

This comes up constantly, and the answer depends on what you’re trying to clean.

White vinegar diluted with water (a 1:4 ratio of vinegar to water) can help remove some mineral scale and calcium buildup. However, it does little against body oils and organic contaminants, which are among the biggest causes of filter performance issues.

Dawn dish soap can remove grease, but it is risky for spa filters. Any leftover soap residue can cause significant foaming in your hot tub. A purpose-built hot tub filter cleaner is safer, more effective and specifically designed for jacuzzi filtration and spa cartridges. 

Special Consideration: EcoPur Mineral Cartridges

If your Hot Spring® spa uses an EcoPur® mineral cartridge, treat it differently from a standard filter. Never soak EcoPur® cartridges in a chemical filter cleaner. The solution can damage the mineral media and shorten its lifespan. Instead, gently rinse the cartridge with a hose, allow it to dry and reinstall it.

These cartridges should be replaced according to their recommended schedule, typically every four months, even if they still appear clean.

Special Consideration: Hot Tub Folliculitis

Hot tub folliculitis is a skin infection caused by Pseudomonas aeruginosa bacteria that colonize spa water and surfaces when sanitizer levels drop too low. If anyone who used your spa develops a rash of itchy red bumps (typically on the trunk and limbs within 12-72 hours of soaking), the tub needs a full decontamination before it’s used again. Knowing how to clean jacuzzi filters after a folliculitis outbreak is key. 

The process requires flushing the plumbing lines with a biofilm purge product to clear bacterial colonies that live in the pipes. Next, drain and scrub the shell thoroughly, and then refill and shock the fresh water heavily. The filter should be soaked in a filter cleaner solution and inspected carefully. 

If the pleats show permanent discoloration or the cartridge has been in use for over a year, replace it rather than clean it. This is also the right time to test and balance the water chemistry carefully before resuming use. 

Pro Tip: The Two-Filter Rotation System

Using two filters makes maintenance easier and keeps your spa performing consistently. The process is simple. Keep one clean filter ready while the other is soaking. The dirty filter can complete a full overnight cleaning cycle, while your spa continues operating with the clean cartridge.

This prevents reinstalling a damp filter, ensures proper cleaning time and extends the lifespan of both cartridges. For Hot Spring® owners, replacement Tri-X® filters and Freeflow® replacement filters are available through Snake River Pool & Spa. Keeping a spare filter is one of the simplest ways to protect your spa’s long-term performance.

When to Replace a Hot Tub Filter

No amount of cleaning extends a filter’s life indefinitely. Jacuzzi hot tub filter replacement — and replacement for any other spa brand — is typically needed every 12 to 24 months for average use, sooner for heavy use or chemical-intensive water. Signs it is time for replacement include:

• Damaged or flattened pleats
• Cracked plastic end caps or internal cores
• Permanent discoloration that does not improve after cleaning
• Reduced water clarity or weak jet performance despite proper maintenance

If you are unsure whether your filter needs replacement, our team at Snake River Pool & Spa can inspect it and recommend the right solution. Our Valet Care Plans also include regular filter cleaning for owners who prefer professional maintenance support.

FAQs – Frequently Asked Questions

What is the best way to clean your hot tub filters?

Turn off the power, remove the filter and rinse it at a 45-degree angle with a garden hose. For a monthly deep clean of the hot tub filter, soak it overnight in a dedicated hot tub filter cleaner solution, rinse thoroughly and let it air dry completely before reinstalling.

Can hot tub filters be cleaned and reused?

Yes. With proper weekly rinsing and monthly chemical soaking, most spa filter cartridges can be maintained effectively for 12 to 24 months before replacement is needed. The key is following the full routine, because rinsing alone isn’t enough to remove body oils and scale.

Can you use Dawn dish soap to clean hot tub filters?

It’s not recommended. Dawn cuts grease, but leaves residue that causes heavy foaming in the spa if not rinsed out completely. A purpose-formulated hot tub water filter cleaner is safer, more effective and won’t risk turning your hot tub into a bubble bath.

How often should I replace a hot tub filter?

Every 12 to 24 months for average use. Replace sooner if the pleats are collapsed or frayed, the end caps are cracked or water clarity doesn’t recover after a thorough cleaning. When in doubt, bring it in; our team can take a look.