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:
- Every two to three weeks: take the cartridge out and rinse it with water
- At each water change: deep clean with Filter Cleaner
- Heavy use: rinse more often and build the deep clean into a stricter schedule
- Cloudy water or weak flow: check the filter immediately (and see our guide to cloudy, foamy or green hot tub water)
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.
How to clean your hot tub filter, step by step
- Switch off and remove the cartridge. Turn the spa off at the isolator, then lift the cartridge out of the filter housing.
- Rinse off the loose dirt. Use a garden hose or a tap to wash the cartridge down, working between the pleats, until all visible dirt and debris have gone.
- Soak it. For a deep clean, dissolve the Filter Cleaner in warm water in a clean bucket large enough to submerge the whole cartridge, and leave it to soak overnight.
- Rinse again. Rinse the cartridge thoroughly with fresh water to remove every trace of cleaning solution, so none of it ends up in your spa water.
- Dry it naturally. Always let the filter dry fully before putting it back. It performs better and lasts longer that way.
- Refit and switch back on. Seat the cartridge correctly in the housing, then restore power.
Tip: Keep a spare filter. While one cartridge is soaking or drying, you can drop the clean, dry spare straight in, so the spa is never left waiting for a filter.
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.
Not sure whether yours has reached that point? Our guide on when to replace your hot tub filter lists the signs to look for.
Frequently asked questions
How often should I clean my hot tub filter?
Rinse it every two to three weeks, or more often with heavy use. 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.
Should I keep a spare filter?
Yes, it's a good idea. A spare lets you swap in a clean, dry cartridge straight away while the other one soaks and dries naturally.
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.
Filter care schedule by spa type
How often you clean and replace a filter depends on the type of spa and how heavily it is used. Use this as a starting point and adjust for your household.
| Spa type | Rinse | Deep clean | Replace |
|---|---|---|---|
| Acrylic hot tub with Glacier filter | Every 2 to 3 weeks | Every water change | Every 6 months for best performance, up to 12 months for economy, sooner with heavy use |
| Other hard-shell hot tubs | Every 2 to 3 weeks | Every water change | Every 6 to 12 months |
| Swim spa | Every 2 to 3 weeks | Every water change | Every 6 to 12 months |
| Inflatable or portable spa | Every few days of use | Weekly in busy periods | Every 4 to 6 weeks |
Rotating two filters
A spare cartridge makes the routine much easier. A simple rotation looks like this:
- Mark both cartridges, for example with a small "A" and "B" on the end cap in waterproof pen.
- Run filter A while filter B is clean and dry in a cupboard.
- At the next deep clean, swap B in straight away and soak A overnight in Filter Cleaner.
- Let A dry fully, then store it until the next swap.
- Note the date you first fitted each one, so you know when both are due for replacement.
Replace both together when the time comes, so one worn cartridge is not left in the rotation. A filter cleaning brush also helps when rinsing between tight pleats.
Signs a filter needs replacing
- The pleats are frayed, torn or feel soft and flattened.
- The end caps are cracked or the core is split.
- Weak jets or cloudy water come back within days of a deep clean.
- It has reached the replacement interval in the table above.
You will find replacement cartridges, including Glacier filter sets, swim spa filters and portable spa filters, in our filters collection.
Can I put a filter in the dishwasher or washing machine?
No. The heat and detergents can damage the pleats and leave residue that causes foam in the spa. Rinse with a hose and soak in a spa filter cleaner instead.
Can I run the hot tub without a filter for a day?
It is best not to. Debris goes straight into the pumps and heater. A spare filter means you never need to.
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:
