How to Clean a Hot Tub Filter (Using Sundance® Spa Filters the Right Way)

Your Sundance® spa is designed to be a sanctuary—a place where warm water, thoughtful design, and quiet moments come together. But even the most advanced hydrotherapy system depends on something surprisingly simple: a clean hot tub filter. When you take a few minutes to care for your filter properly, you’re not just maintaining equipment. You’re protecting the clarity, comfort, and wellness experience that drew you to your spa in the first place.

Hot tub filters serve as the first line of defense against contaminants, trapping oils, hair, and debris. Hot tub filters trap contaminants like body oils, hair, and debris to maintain clean water.

This comprehensive guide walks you through everything you need to know about filter maintenance, from quick weekly rinses to thorough cleaning and timely replacement—all with Sundance® spa filters as your example.

Key Takeaways

• Dirty filters cause cloudy water, unpleasant odors, and contribute to up to 75% of hot tub circulation issues
• Sundance® pleated cartridge filters should receive a weekly rinse, monthly deep cleaning, and replacement every 12–24 months depending on usage
• Using Sundance-approved filter cleaners and genuine Sundance filters protects pumps, heaters, and advanced water care systems like ClearRay® UV-C
• Avoid bleach, dishwasher detergent, and pressure washers—these damage filter media and can ruin your filter prematurely
• Purchase OEM Sundance® filters and cleaners directly from the Sundance Spas website for optimal performance and warranty protection

Why Cleaning Your Hot Tub Filter Matters

Think of your filter as the lungs of your hot tub. Every time you soak, the filter works quietly in the background—trapping dirt, body oils, hair, leaves, pollen, and other debris before they can circulate through your spa’s system. Hot tub filters serve as the first line of defense against contaminants, trapping oils, hair, and debris. Hot tub filters trap contaminants like body oils, hair, and debris to maintain clean water.

When a tub filter becomes clogged, your Sundance circulation and jet pumps must work significantly harder to move water. This extra strain can shorten pump and heater life, trigger error codes, and cause frustrating flow issues. Even with advanced Sundance water care technology like ClearRay® UV-C sanitizing systems, the filter remains your first line of defense for water clarity and hygiene.

Signs your filter needs attention:

• Cloudy water: Debris and contaminants bypassing the filter
• Slow heating: Restricted water flow to the heater
• Reduced jet pressure: Pump struggling against a clogged filter
• Increased sanitizer use: Filter not removing organic material effectively
• Unusual odors: Bacteria growth from trapped organic matter

Here’s the good news: routine filter care is far less expensive than replacing pumps or control systems. A few minutes of regular cleaning protects your investment and keeps your Sundance spa performing beautifully for years to come.

How Often to Clean and Replace a Hot Tub Filter

The exact frequency depends on your specific situation—bather load, cosmetics use, nearby trees, and local hard water conditions all play a role. However, these guidelines work well for most Sundance® spa owners:

Recommended Maintenance Schedule:

Maintenance Type

Frequency

Time Required

Quick hose rinse

Every 7 days

5–10 minutes

Chemical deep clean

Every 4–6 weeks

Overnight soak

Full replacement

Every 12–24 months

5 minutes

For rental properties, vacation homes with heavy use, or spas installed near dusty roads or many trees, consider more frequent cleaning—perhaps a rinse every few days and deep cleaning every 2–3 weeks.

When to replace instead of clean:

• Hot tub water stays cloudy even with correct chemistry
• Filter pleats look collapsed, matted, or permanently discolored (grey or brown)
• Visible damage to end caps or filter fibers
• Filter is over 18–24 months old regardless of appearance

One critical note: never run your Sundance spa without a filter installed, even briefly. This risks sending debris directly into the circulation system and may void your warranty. If you need to clean your filter, either work quickly or keep a backup cartridge on hand.

Understanding Sundance® Hot Tub Filter Types

Sundance Spas uses high-quality pleated cartridge filters across its entire lineup, including the 680™, 780™, 880™, and 980™ Series. The exact filter size and part number varies by spa model and year, so confirming the right match before ordering is essential.

How to find your correct filter:

1. Check your Sundance owner’s manual for the recommended filter part number
2. Look at the label on your existing cartridge
3. Locate your spa’s serial plate for model and year information
4. Contact an authorized Sundance dealer for assistance

Some newer Sundance models integrate filtration with advanced water management systems like MicroClean® or dual-stage filtration, which may use more than one filter housing. Always verify your specific spa model requirements.

Why genuine Sundance filters matter:

Genuine Sundance filters are engineered for precise flow rate, pleat density, and fit. Off-brand cartridges may look similar, but they can reduce filtration effectiveness, restrict water flow, or stress your pumps. For optimal performance and to protect your warranty, stick with OEM filters from the official Sundance Spas website or authorized dealers.

Step-by-Step: Weekly Rinse for Your Hot Tub Filter

A weekly rinse is your foundation for clean filters and crystal clear water. This quick routine takes under 10 minutes and requires no special tools—just a standard garden hose.

What you’ll need:

• Garden hose with spray nozzle
• Access to clean water

The process:

1. Power down your spa at the control panel and, ideally, at the breaker to protect electronics while the filter is removed
2. Remove the filter from the skimmer or filter bay. Lift off the weir door or skimmer lid, twist the filter counterclockwise (if threaded), and pull it straight up
3. Rinse between each pleat using your garden hose with a standard spray nozzle. Work from top to bottom, rotating the cartridge as you go. The goal is to rinse away trapped hair, leaves, and surface oils from between the pleats
4. Inspect for damage as you rinse. Check for cracked end caps, torn pleats, or a warped core. If you find any damage, replace the filter immediately
5. Reinstall the cartridge. It’s safe to reinstall the filter while damp—Sundance systems are designed to operate with a wet cartridge. If you have a backup filter, you can let the cleaned one dry completely before storing it

Important tips:

• Never use a pressure washer—the high-pressure water can tear filter media and damage pleats
• Spray gently but thoroughly between every pleat
• Rinse immediately after removal; if debris dries onto the filter, it becomes much harder to remove

Monthly Deep Clean: How to Clean a Hot Tub Filter Thoroughly

While your weekly rinse handles surface buildup, a monthly deep cleaning removes what water alone cannot: body oils, sunscreen, cosmetics, and fine particles that accumulate within the filter fibers over time. This thorough cleaning is essential for maintaining filter life and water’s quality.

What You’ll Need

• Sundance-approved hot tub filter cleaner or spa-specific cleaning solution
• Large bucket (sized to fully submerge the filter)
• Garden hose
• Gloves and eye protection

Deep Cleaning Steps

1. Remove and pre-rinse the filter using your garden hose to remove loose debris first
2. Prepare your cleaning solution by mixing filter cleaner with warm water in a clean bucket according to the manufacturer’s instructions. Using warm water can accelerate the cleaning effectiveness
3. Submerge the filter completely and allow it to soak overnight—typically 8–12 hours. The solution will dissolve oils, loosen trapped contaminants, and break down buildup that rinsing alone cannot address
4. Rinse thoroughly the next day until no visible suds remain. Pay special attention to the undersides of pleats and ensure all residue left by the cleaner is completely flushed away
5. Allow to dry or reinstall depending on whether you have a backup filter. A second Sundance filter allows one to be in service while the other soaks or dries

For hard water areas:

If you have hard water, mineral deposits can accumulate on your filter and restrict flow. After your regular deep clean, consider using a specialized spa-scale remover designed for spa filters. These products effectively clean away calcium buildup without damaging the glue or plastic components.

Safety reminder: Always wear gloves when handling concentrated cleaners. Never mix different types of chemicals (such as acid and chlorine) in the same bucket—this can create dangerous reactions.

What to Avoid When Cleaning a Hot Tub Filter

Improper cleaning methods might seem like time-savers, but they can quickly ruin your filter or damage expensive Sundance spa components. Protecting your filter means knowing what not to do.

Unsafe Cleaning Methods

Item

Why It’s Harmful

Pressure washers

Can tear pleats and open filter media, reducing filtration

Wire or stiff brushes

Damages delicate filter fibers and creates holes

Bleach

Too harsh—eats away at filter media and causes premature failure

Household acids

Weakens fabric fibers and glue joints

Strong degreasers

Can dissolve filter materials

Dishwasher

Heat deforms plastic, detergents leave residue, spray misses pleats

Laundry detergent

Leaves residue that causes foaming in hot tub water

Foaming cleaners

Residue creates endless foaming and water quality problems

Even white vinegar, while safe to use, isn’t potent enough to effectively clean heavily soiled filters. It can help with light mineral deposits but shouldn’t replace proper spa filter cleaners for routine deep cleaning.

The safest approach: Stick with Sundance-approved cleaners and the processes outlined in your owner’s manual. This protects your filter, your pumps, your heaters, and your sensors—not to mention your warranty.

When and How to Replace a Hot Tub Filter

Even with perfect maintenance, every filter eventually reaches the end of its filter life. The pleats gradually lose structure, and the media becomes less effective at trapping dirt and contaminants. Knowing when to replace rather than clean saves you from expensive repairs and persistent water issues.

Replacement Timeline

• Typical home use (3–5 times weekly): Every 12–18 months
• Heavy use or commercial settings: Every 6–12 months
• Light use (once weekly or less): Up to 24 months with proper maintenance

Signs it’s time for a new filter:

• Permanent discoloration that doesn’t improve with deep cleaning
• Crushed, wavy, or matted pleats
• Cracked end caps or damaged core
• Persistent cloudy water despite correct chemistry
• Frequent filter-related error messages on your spa control panel

Replacement Process

1. Turn off power to the spa at the control panel and breaker
2. Remove the old filter and compare it with your new Sundance OEM filter to confirm the match
3. Lower the new filter into the housing
4. Twist clockwise until snug (if threaded) or seat firmly according to your spa model

Pro tip: Mark the installation date on the cartridge end cap with a permanent marker. This makes future replacement scheduling simple and takes the guesswork out of proper maintenance.

For genuine Sundance® replacement filters that match your spa perfectly, visit the Sundance Spas website or contact an authorized dealer.

How Clean Filters Support Sundance® Wellness Technology

A clean filter isn’t just about maintenance—it’s about maximizing the wellness experience your Sundance spa was designed to deliver. When water flows freely through a well-maintained filter, everything works better: clearer water, less odor, and more enjoyable hydrotherapy sessions.

What depends on your filter:

Your Sundance spa’s advanced features—powerful hydrotherapy jets, ergonomic seating, and integrated sanitizing systems like UV-C and ozone—all rely on unrestricted water flow. A dirty filter forces pumps to work harder, reduces jet pressure, and can interfere with the performance of your entire water care system.

Benefits of proper filter care:

• Use fewer chemicals to maintain water balance
• Spend less time troubleshooting water problems
• Enjoy consistently crystal clear water
• Protect your investment in premium spa features
• Extend the life of pumps, heaters, and electronics

When your filter works effortlessly, so does your spa—giving you more moments of pure relaxation and fewer worries about equipment issues.

Ready to ensure your Sundance spa performs at its best? Visit the Sundance Spas website to explore compatible filters, cleaners, and water care upgrades designed specifically for your spa.

FAQ

Can I soak my Sundance® hot tub filter in vinegar or baking soda?

A diluted white vinegar solution can help dissolve light scale and mineral deposits, making it useful for occasional supplemental cleaning in hard water areas. However, vinegar is generally milder than dedicated spa filter cleaners and won’t effectively remove heavy buildup of grease and body oils.

Baking soda works better for minor surface cleaning and pH adjustment in your water rather than as a primary filter soak agent. For best results, use Sundance-approved commercial filter cleaners as your main deep-clean method, reserving vinegar only as an occasional supplement for mild mineral deposits.

Do I need to let the filter dry completely before putting it back in?

No—it’s perfectly safe to reinstall a filter while it’s still damp after thorough rinsing. Sundance systems are designed to operate with a wet cartridge, so you don’t need to wait.

That said, allowing filters to dry completely can help them last slightly longer by letting the filter fibers relax between uses. This is most practical if you keep a second Sundance filter on hand to rotate. The most important rule: never reinstall a filter that still has visible soap or cleaner residue. Always rinse until the water runs completely clear.

Is it okay to use my hot tub while the filter is out for cleaning?

Your spa should not be run or used without a filter installed. Running the circulation system with no filter allows debris to flow directly into pumps, heaters, and plumbing—potentially causing damage and voiding your warranty.

The best practice is keeping a second Sundance® filter cartridge so one can be in service while the other undergoes deep cleaning or drying. If you must remove the filter briefly, ensure the circulation is completely off during that time and reinstall the filter before turning anything back on.

Why is my water still cloudy even after I cleaned the filter?

Persistent cloudy water after cleaning often indicates the filter media is worn out and needs replacement rather than another cleaning cycle. This is especially likely if your cartridge is over 18–24 months old.

However, other factors can cause cloudiness even with a clean filter:

• Unbalanced water chemistry (pH, alkalinity, or sanitizer levels)
• High bather load without adequate shocking
• Insufficient circulation time

Test and balance your water chemistry first, shock the spa if needed, and then assess whether your filter is truly restoring water clarity. If not, it’s time for a replacement.

Where can I buy the right replacement filter for my Sundance® spa?

Start by locating your spa’s model name and year—this information is usually on the serial plate or in your owner’s manual. Match this to the correct filter part number to ensure compatibility with your specific spa model.

For genuine OEM Sundance® filters and compatible cleaning products, visit the official Sundance Spas website or contact an authorized Sundance dealer. Using genuine filters maintains water quality, protects your equipment from damage, and supports your warranty coverage for long-term peace of mind.

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