All You Need To Know When Buying Replacement Hot Tub Filters

When do Filters on Hot Tubs Need Replacing?

There’s no exact timescale for changing your hot tub filter, it really does depend on how often you use your hot tub but it is definitely recommended to change it every 2-5 years. It’s normally easy to tell if your filter needs replacing by the colour, water flow, high differential pressure and the overall condition of your filter.

  • Check if your filter is a grey, green or maybe yellow in colour after cleaning
  • The hot tub water is not staying clean
  • The filter gets blocked much quicker, meaning you have to clean it more often
  • There’s restricted water flow and/or high differential pressure (high differential pressure is the difference between the pressure coming in and going out)
  • A cracked or damaged cartridge – which is rare and usually an initial plumbing error
  • The filter element starts to come apart or shred

We also advise changing the filter before you use the hot tub if purchased second hand from someone else, whether the filter is clean or not.

How to Replace Your Filter:

Replacing your hot tub filter is much easier than cleaning it as you’re essentially just removing it, as you would when cleaning, and replacing it with a clean, fresh one. The key thing when replacing your filter is to make sure you’ve got the correct dimensions – usually measured in diameter. It is measured from the outside edge of one end cap to the other outside edge of another. There is often a make and model number on the filter so you know you’re ordering the correct size but if there’s not or you cannot locate it – the measurement method is the best way. It is always best to have a hot tub filter spare to avoid any downtime if your filter breaks.
We also have a filter finder on our website to make sure you order the correct filter for your hot tub.

Types of Filter and Where to Shop

Once you have your correct dimensions for your filter, you need to know the best place to find one! At 1 Stop Spas, you can shop hot tub filters by size and we have over 50 different filters to choose from. Our supplier for filters are Darlly, made using Reemay which is the highest quality spun bonded polyester material, it doesn’t fray, tear and is resistant to Chlorine, Bromine and Acid.
We recommend using a trusted retailer of Darlly, like ourselves, so you are guaranteed quality. You can use our filter finder here or shop for all sizes.
If you want the best performance out of your hot tub filters, stick with an established and well-known brand like Darlly. Don’t be tempted to buy a half-priced cartridge that won’t last half as long, and you’ll have a cleaner and healthier hot tub! If you have any questions or are struggling with dimensions – please feel free to contact our friendly team of experts.

How to Clean Hot Tub Filters & Increase Their Lifespan (Saves Money, Time & the Environment!)

Cleaning your filter properly is the best way to ensure maximum timespan and quality use throughout.
Weekly – Remove the filter and rinse under a soft stream of water
Monthly – Remove and clean with a specialist chemical spray
Every 3 months – Remove the filter and soak it in a chemical solution. This is when a spare filter also comes in handy, you can pop your spare one on to prevent any downtime so your hot tub is always ready to go.
Things to make sure of when cleaning your filter:

  • Let the filter fully dry before replacing it
  • Always wear rubber gloves when handling chemical solution
  • Use a soft bristle brush when cleaning the filter
  • Never use high-pressure water to clean it

If you have any questions, concerns or simply need advice feel free to contact us here.
Happy soaking!


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