F
Restricted flow
Blocked pleats make it harder for water to pass through, so circulation can slow and jets may feel weaker.
Your filter is working overtime
Filter care guide
Your filter works harder than you think.
It does more than catch bits in the water. A clean cartridge filter helps your spa keep consistent flow, protects pumps, supports heater performance and keeps the water clearer for longer.
FlowHelps water move freely through your spa
HeatSupports stable heater performance
ClarityCaptures the everyday debris you do not want soaking with you
1. Intro
What are cartridge filters?
Every time your hot tub circulates, the cartridge filter is working in the background. It catches the everyday things that build up in spa water: body oils, lotions, hair, dust, leaves and fine particles.
Keeping the filter clean is important because water has to pass through it before the rest of the system can do its job properly. When the cartridge is clean, the water can flow more consistently through the pump, heater and pipework.
- 1Cleaner water with fewer floating particles.
- 2Better circulation around the hot tub shell.
- 3Less strain on important components.
2. The consequences
What happens when a filter gets dirty?
P
Extra pump strain
Your pump has to work harder to move water through the cartridge, which can create unnecessary pressure on the system.
H
Heating issues
Poor flow can affect how efficiently water passes the heater, making heating less consistent and fault messages more likely.
Filter blockage impact check
Move the slider to see how a blocked cartridge can affect the spa system.
Flow reduced
3. Weekly maintenance
How to maintain your filter.
Read
Keep the weekly clean simple.
Remove the cartridge and rinse between the pleats to clear loose debris. A weekly spray cleaner helps lift the oils and residue that water alone can leave behind, especially after regular hot tub use.
Let the cleaner do the hard work, rinse thoroughly, then refit the cartridge. This small habit helps protect water flow before the filter becomes visibly dirty.
Weekly use
View product
Pure-Spa Instant Filter Cleaner Liquid 500ml
Use this as part of your weekly routine to help clear debris, body oils and residue from the filter pleats.
4. Deep clean
Filter dirty, discoloured or not working well?
Read
When the pleats look grey or greasy
A deeper cleaner helps break down the residue that water alone will not shift, especially after heavy spa use.
When jets feel weaker than usual
If flow feels restricted after rinsing, the pleats may be holding oils and fine debris. A soak-style cleaner can help restore performance.
When the cartridge is stained or discoloured
Discolouration can be a sign of built-up contaminants. Deep clean first, then replace if the filter still looks tired or performs poorly.
Deep clean
View product
Pure-Spa Cartridge Filter Cleaner 1L
Use when the filter needs more than a weekly spray, especially if it is dirty, discoloured or not performing as it should.
Read
5. Replace
If your filter is over a year old, replace it.
Replacement
Find your filter in 30 seconds
Find your replacement cartridge
If the filter is over a year old, damaged, stained or still not flowing after cleaning, replace it with the right cartridge.
Quick answers
Filter care FAQs.
Rinse it weekly and use an instant filter cleaner regularly. Clean more often after heavy use, parties or if the water looks cloudy.
Yes. If water cannot flow properly through the system, heater performance can become less consistent and flow-related errors are more likely.
Replace it after around a year of use, or sooner if it is damaged, collapsed, badly discoloured or still clogged after a deep clean.
Hydrospares filter care
Cleaner filters make life easier for the whole spa.
Keep a weekly cleaner on hand, deep clean when performance drops, and replace old cartridges before they start making your pump and heater do all the hard work.
30 sec
Use the Hydrospares filter cartridge page to find the right replacement quickly.