If you’ve recently purchased a hot tub or are considering getting one, understanding how the filter system works is essential. Hot tub filters play a critical role in keeping the water clean, safe, and inviting. This beginner-friendly guide will walk you through how hot tub filters work and what UK users should know to keep their spa in top condition.
What Does a Hot Tub Filter Do?
A hot tub filter’s main job is to trap dirt, oils, dead skin cells, and other unwanted debris from the water. While chemicals like chlorine and bromine sanitise the water by killing bacteria, the filter physically removes particles that can make your water cloudy or unhygienic.
How the Filtration System Works
Most hot tubs in the UK use a cartridge filter system. When the pump is running, it pulls water through the skimmer and into the filter housing. The cartridge inside has pleated fabric that catches fine particles and traps them. The clean water is then pushed back into the tub through the jets.
Many modern tubs also have a circulation pump that runs quietly and continuously, filtering water even when the main jets are off. This helps maintain water clarity and reduces the strain on your heater and other components.
Types of Filters
-
Cartridge Filters: The most common in UK hot tubs. They are easy to remove, rinse, and replace.
-
Sand Filters: Rare in residential hot tubs but used in some commercial settings. They use sand to trap debris.
-
Diatomaceous Earth (DE) Filters: Less common but highly effective, using a fine powder made from fossilised algae.
How Often Should You Clean and Replace a Filter?
For UK hot tub users, it’s recommended to:
-
Rinse the filter weekly with a hose to remove surface debris.
-
Deep clean the filter every 4-6 weeks using a filter cleaner to break down oils and grime.
-
Replace the filter every 12-18 months, depending on use and maintenance.
Why Proper Filtration Matters
A well-maintained filter extends the life of your hot tub, reduces the need for chemicals, and provides a more enjoyable soak. Poor filtration can lead to cloudy water, foul odours, and even damage to your pump and heater.
Conclusion
Whether you’re soaking under the stars or enjoying a relaxing evening after a long day, clean water is key to a great hot tub experience. By understanding how your filter works and keeping it in good shape, you can enjoy crystal-clear water all year round.
Regular maintenance and a bit of know-how go a long way — and your hot tub will thank you for it!
