Description
Overview
Magnum replacement spa filter cartridge designed to suit Stoked Stainless spa systems that specify the CH30 cartridge. It matches the original dimensions exactly: 118mm outside diameter, 296mm length, a half-round handle on the top end cap, and a 46mm fine MPT thread on the bottom end cap.
Getting the right cartridge matters for a spa. A correctly seated CH30 filter maintains steady flow through the circulation pump, keeps water clear between chemical treatments, and makes routine maintenance predictable. An incorrect fit allows water to bypass the filter media, which defeats filtration and puts strain on the pump.
Compatible Stoked Stainless Models
This cartridge suits the following Stoked Stainless spa and plunge pool models:
-
Hybrid Spa
-
Plunge Pool 2m x 2.5m
-
Plunge Pool 2m x 3m
-
Round Spa 1.6
-
Round Spa 1.9 (6 person)
-
Round Spa 2.2 (8 person)
-
Square Spa 2m x 2m
If your model is not listed or you are unsure, check the label on your existing filter cartridge or the data plate on your spa housing. The outside diameter, length, and bottom end cap thread type are the three measurements that confirm compatibility.
Key Features
-
New Zealand-made Magnum spa filter cartridge.
-
Direct replacement for Stoked Stainless CH30 spa filter systems
-
Pleated filter media captures fine debris, body oils, and particulates.
-
Half-round handle on top end cap for straightforward removal
-
46mm fine MPT thread on bottom end cap (note: fine thread, not coarse)
-
Correct sizing ensures consistent water flow and stable pump pressure.
-
Designed for regular spa use and repeated cleaning cycles
Specifications
-
Outside diameter: 118mm
-
Length: 296mm
-
Top end cap: Half-round handle
-
Bottom end cap: 46mm fine MPT thread
-
Filter media: Pleated
-
Manufacture: New Zealand (Magnum)
-
Compatible system: Stoked Stainless CH30
Maintenance and Cleaning
Stoked Stainless recommends keeping a second CH30 cartridge on hand so filters can be rotated during cleaning. Remove the filter, rinse it thoroughly with a garden hose working from the inside of the pleats outward, then soak it overnight in a bucket with two cups of bleach or a dedicated filter cleaning solution. Rinse the following day again and allow it to dry before storing. While one cartridge soaks, the second keeps the spa running.
Do not use high-pressure washing on the filter media, as this can force debris deeper into the pleats or damage the material.
Replace the cartridge when cleaning no longer restores normal flow and pressure, or when the pleated media shows visible damage or permanent discolouration that rinsing cannot clear.
Installation
-
Switch off the spa pump before opening the filter housing.
-
Grip the half-round handle on the top end cap and lift the cartridge straight out of the housing.
-
Rinse any loose debris from inside the housing.
-
Lower the new CH30 cartridge into the housing, ensuring the 46mm fine MPT thread on the base engages correctly with the housing seat.
-
Refit the housing cover securely and restart the pump.
-
Check that the flow returns to normal within a few minutes of startup.
The bottom thread is a fine MPT thread. Do not force it or over-tighten, as this can damage the thread on the housing.
Frequently Asked Questions
Is this a direct replacement for the Stoked Stainless CH30 cartridge?
Yes. The dimensions and end cap configuration match the original CH30 exactly: 118mm outside diameter, 296mm length, half-round handle top, and 46mm fine MPT thread base.
Is this cartridge made in New Zealand?
Yes. Magnum cartridges are manufactured in New Zealand.
How do I know if the CH30 is the right filter for my spa?
Check the label on your existing cartridge or look for the model designation on the spa filter housing. The key measurements to confirm are outside diameter (118mm), length (296mm), and the bottom end cap thread type (46mm fine MPT). If unsure, contact us with your spa model, and we can confirm compatibility.
Can the CH30 cartridge be cleaned and reused?
Yes. Rinse it with a garden hose, soak overnight in diluted bleach or filter cleaner, rinse again and allow to dry. It can be cleaned multiple times. Replace it when cleaning no longer restores adequate flow, or the media is visibly damaged.
How often should I replace the spa filter cartridge?
Most spa owners replace their cartridge every one to two years, depending on usage and how regularly it is cleaned. A cartridge that builds pressure quickly, even after a thorough cleaning, has reached the end of its useful life.
What happens if I use the wrong size cartridge?
An incorrectly sized cartridge will not seat properly in the housing, allowing unfiltered water to bypass the media. This reduces water clarity, increases chemical demand, and can cause the pump to work harder than necessary.
Pro Tip
Keep two CH30 cartridges in rotation rather than one. While one soaks overnight in a cleaning solution, the spa keeps running on the second. This extends the working life of both cartridges, keeps the spa in continuous use, and means you are never waiting on a wet filter to dry before getting back in the water.