How Often Should You Clean Your Hot Tub Filter? A Practical Guide
Xavier LabelleLast updated: April 2026 · Reading time: approx. 8 minutes · Author: Xavier Labelle
A clean hot tub filter is the foundation of clear water and effective water care. Many spa owners focus mainly on chlorine or pH, and underestimate the fact that filtration is what actually keeps the whole system running properly. The filter traps the things you don't want floating in your water — skin cells, body oils, lotions, cosmetic residue, pollen and dust. If it isn't looked after regularly, filtration drops, water quality suffers and the rest of the spa has to work harder.
In a nutshell
Your hot tub filter should be rinsed regularly and given a thorough deep clean on top of that. We recommend using Canadian Spa Filter Cleaner 1kg at every water change. Dissolve the granules in warm water, soak the filter cartridge overnight, then rinse and dry it before refitting.
At a glance
- A dirty filter can lead to cloudy water, higher chemical use and poor circulation
- Rinsing with water alone often isn't enough long term
- Build-up and biofilm can develop deep between the pleats
- Canadian Spa recommends a deep clean at every fill and drain
- Canadian Spa Filter Cleaner is a 1kg granular cleaner for thorough cartridge cleaning
Why filter cleaning matters
The filter is what handles the mechanical cleaning of your hot tub water. As water circulates, particles get caught in the cartridge — and over time more and more of it builds up, even when the filter still looks reasonably clean from the outside.
Typical residues in spa water include skin cells, body oils, lotions, cosmetic residue, pollen, dust and other organic particles. If those stay lodged in the pleats, water flow and overall efficiency drop.
A clogged filter often leads to:
- Cloudy hot tub water
- Higher chemical consumption
- Poor water circulation
- Higher electricity use
- Extra strain on the pump
A clean filter, on the other hand, lets water move freely, helps UV and ozone systems work efficiently, and keeps water quality consistent. That's why filter cleaning belongs near the top of any sensible hot tub maintenance routine.
Note: A filter can still look clean on the outside while build-up and biofilm have already developed inside. That's exactly why a surface rinse isn't enough on its own.
How often should you clean your hot tub filter?
The single most important rule: regularly, and not just when problems start to show. For day-to-day care, a quick rinse keeps loose debris in check. For a proper deep clean, that usually isn't enough on its own.
We recommend using Canadian Spa Filter Cleaner at every fill and drain. It slots neatly into a regular maintenance routine and helps keep cartridges clean and ready to work.
A practical rhythm:
- In between: rinse the filter with water
- At each water change: deep clean with Filter Cleaner
- Heavy use: build the deep clean into a stricter schedule
- Cloudy water or weak flow: check the filter immediately
To deep clean with Canadian Spa Filter Cleaner, dissolve the 1kg granules in warm water, soak the cartridge overnight, then rinse it thoroughly with fresh water and let it dry before refitting.
Cleaning your filter: what not to use vs. Canadian Spa Filter Cleaner
It's tempting to reach for whatever's already in the cupboard, but a lot of common cleaning methods either only clean the surface or actively damage the cartridge material. Here's why a dedicated filter cleaner is the more sensible option.
| Unsuitable methods | Canadian Spa Filter Cleaner (1kg granules) |
|---|---|
| Rinsing with water only — mainly removes loose dirt | Deep clean — helps lift build-up and grime from inside the pleats |
| Washing-up liquid or household cleaners — can leave residues | Designed specifically for spa filter cartridges and regular use |
| Aggressive chemicals — can damage the cartridge material | Gentle on materials — won't attack the cartridge |
| Surface cleaning only — biofilm and build-up stay inside | Overnight soak — noticeably more thorough cleaning |
| No fixed routine — cleaning gets pushed back | Clear recommendation — use at every water change |
Another plus: Canadian Spa Filter Cleaner is a granular product dissolved in warm water, which makes it easy to slot the deep clean into your regular maintenance.
What to know about the Canadian Spa Glacier Filter
The Canadian Spa Glacier Filter goes beyond plain mechanical filtration. It features an antimicrobial layer, a silver-ion infused plastic body, and a Reemay® filter medium with antimicrobial protection — all of which support cleaner water alongside your normal water care.
Key benefits of the Glacier Filter:
- Antimicrobial layer that actively works against bacteria
- Silver-ion infused plastic body
- Extra microbiological control for cleaner water
- Easy-to-clean pleats
One important point: those antimicrobial properties fade over time. We recommend swapping the Glacier Filter every six months. With careful upkeep, it's technically possible to run one for up to twelve months. If your hot tub gets heavy use or is shared by several people, replacing it every three to four months can make sense.
Important: A filter cleaner doesn't replace a new filter when the cartridge has reached the end of its life. What it does do is keep the cartridge clean and performing well throughout that life.
Frequently asked questions
How often should I clean my hot tub filter?
Rinse it regularly between deep cleans. For a thorough clean, we recommend using Canadian Spa Filter Cleaner at every fill and drain.
Is rinsing with water enough?
Not on its own. Rinsing mainly clears loose debris. Build-up and biofilm can still sit between the pleats and need a proper soak to shift.
How do I use Canadian Spa Filter Cleaner?
Dissolve the granules in warm water, soak the cartridge overnight, rinse thoroughly with fresh water, then let it dry fully before refitting.
How long does a Canadian Spa Glacier Filter last?
For optimal water care we recommend replacing it every six months. With good maintenance, twelve months is technically possible. Heavy use may justify a swap every three to four months.
Can a filter cleaner replace a new filter?
No. Filter cleaner keeps the cartridge clean and effective. Once it's reached the end of its life, the cartridge needs replacing.
Product details & where to buy
Our recommendation: If you want to do more than a surface rinse on your filter cartridge, Canadian Spa Filter Cleaner is a sensible addition to your maintenance routine. The 1kg granules dissolve in warm water; soak the cartridge overnight, then rinse and dry before refitting.
Available on our UK website: