Your hot tub filter is the most underrated component in your whole system. Nobody gets excited about filter maintenance. But a $33 filter that lasts two years is the difference between a hot tub that costs you money and a hot tub that just works.
Here’s what you need to know to keep your filter healthy and your operating costs down.
How Your Filter Actually Works
Your hot tub circulates 24/7. Water goes through a pump, through the jets, and back to the filter. The filter catches particles: dust, dead skin cells, bacteria, organic matter. When the filter gets loaded, water has to work harder to push through. Your pump strains. Your electrical cost goes up. Eventually your filter can’t clean anymore.
Royal Spa uses push-through filtration. Water goes into the filter tank, pushes through the cartridge, and comes back clean. It’s the most common design in hot tubs and it works well when you maintain it.
Some competitors use proprietary filter systems or suction-side filtration. Proprietary means you’re locked into their expensive cartridges (sometimes $80-120 per replacement). Suction-side means there are more mechanical steps that can fail. Royal Spa keeps it simple.
Standard Components, No Vendor Lock-In
This is the philosophy that matters most: your filter cartridge is a standard component. You can buy it from us, you can buy it from a pool supply store, you can order it online. The part fits because it’s a standard size in the industry.
A Royal Spa filter cartridge costs about $33. Lasts about two years if you maintain it. That’s $16 a year in filter cost. Over a decade, you’ve spent $160 on filters.
A competitor with a proprietary filter cartridge costs $80-120 per cartridge. If you replace it every two years, you’re spending $400-600 over a decade. More if you need replacements sooner.
The difference isn’t just money. It’s options. If something is wrong with a standard cartridge, you have choices. You can try different brands. You can order from anywhere. With a proprietary system, you call the manufacturer and pay their price.
Royal Spa designed our system around standard components for exactly this reason.
Your Filter Maintenance Schedule
Here’s the routine that keeps your filter healthy:
Monthly: Rinse your cartridge. Turn off the pump, open the filter housing, pull the cartridge, and spray it gently with the garden hose. Dirt washes out. You’re done. Takes five minutes. Do this every month during heavy-use seasons (summer, spring). Every other month in light seasons.
Every 3-4 Weeks During Summer: Summer is heavy-use season. More swimmers, longer sessions, hotter water. Rinse more frequently. Once a month isn’t enough. Every 3-4 weeks keeps the filter fresh.
Every 18-24 Months: Replace the cartridge entirely. No amount of rinsing restores a worn-out cartridge. After two years, the pleats are degraded, the filter media is tired, water flows slower. Time for new. Cost is $33. Installation takes someone 10 minutes.
Cleaning vs. Replacing: Know the Difference
Rinsing and replacing are not the same thing. Rinsing is maintenance. You do it monthly. It keeps your filter working between replacements.
Replacing is full service. You do it every two years. A new cartridge costs $33 and you’re done.
Some people chemical-clean their filters. There are special solutions that dissolve mineral and chlorine buildup. You soak the cartridge overnight, rinse, and reinstall. This extends the life maybe three to six months.
Chemical cleaning is optional. If you’re already replacing on schedule, you don’t need it. If you live in a high-mineral water area, chemical cleaning might help. Ask when you buy your tub.
What Happens If You Ignore Filter Maintenance
People who don’t maintain filters learn the hard way. Here’s the progression:
Month 1: Filter gets loaded. You don’t notice yet.
Month 2: Circulation slows. Water is cloudier than it should be. You add more chlorine thinking the chemistry is off. It’s not. It’s your filter.
Month 3: Pump is running harder to push water through. Your electrical bill is up. The pump gets hot. You’re stressed.
Month 4: Filter is so clogged that water backs up. Pressure alarm goes off. You finally clean it. Problem solved temporarily.
If you let this cycle happen repeatedly, here’s what fails: your pump wears out faster (because it’s constantly working against clogged filter). Your heater works harder. Your circulation system stresses. Equipment fails earlier than it should.
Maintenance isn’t optional. It’s just cheaper to do it than to ignore it.
The Circulation System and Filtration Work Together
Your hot tub runs its circulation pump 24/7 (or most of the day if you’re on a timer). That means water is always flowing through your filter. A clean filter lets that water move easily. A dirty filter fights it.
Royal Spa’s circulation system is designed for 24/7 use with standard filtration. The pump size, the pipe diameter, the filter housing, all of it assumes you’re using a well-maintained standard cartridge.
Your mineral spa water chemistry system also depends on clean filtration. If water isn’t flowing cleanly through the system, your minerals and ions aren’t distributing evenly. Water chemistry gets weird.
Clean filter + consistent circulation + mineral system = stable water that’s easy to maintain.
Your Filter Maintenance Checklist
This is your entire filter program:
- Rinse cartridge monthly (or every 3-4 weeks in summer)
- Replace cartridge every 18-24 months (~$33)
- Check cartridge condition when you rinse (look for tears, holes, damaged pleats)
- If you see damage, replace immediately instead of waiting
- Keep replacement cartridges on hand so you’re not caught without a spare
- Mark your calendar for the replacement date so you don’t forget
That’s it. Five simple things. Maybe 30 minutes a year of your time. $16-33 a year in cost.
One More Reason Filter Maintenance Saves Money
Every day your filter is clean, your pump runs at optimal efficiency. Every day it’s clogged, your pump wastes energy fighting water resistance.
A loaded filter can increase your electric bill 10-15%. That means a maintained filter could save you $30-50 a year depending on your usage.
Over the life of your tub, that’s hundreds of dollars in saved electricity.
Plus, a pump that isn’t constantly fighting a clogged filter lasts longer. That’s another big cost avoided.
Maintenance isn’t something you do instead of using your tub. It’s something you do so your tub costs less to own.
Come see us if you want to walk through your filter schedule or grab a spare cartridge for backup. We keep standard components in stock.
