Description
The WY45 is one of the most widely used spa filter cartridges in New Zealand, commonly fitted to Waterway 50 skim systems and a wide range of spa brands. This genuine Magnum filter is made in NZ and designed to handle regular spa use while keeping water clear and flow steady.
Key Features
- Genuine Magnum WY45 cartridge made in New Zealand
- Widely used across multiple spa brands and models
- Pleated media for strong dirt holding capacity
- Designed to maintain water clarity and flow
- Durable construction for repeated cleaning cycles
- Multi-buy discount available for easier replacement planning
Important Note
If the cartridge does not clearly show Magnum Filters, WY45, Made in New Zealand on the cap, it is not a genuine NZ-made Magnum WY45. This model is a unique Magnum product, so checking this matters when replacing.
Where It’s Used
Used in spa systems with Waterway 50 skim setups and similar configurations. Common across residential spas where consistent filtration and easy replacement are needed.
Fitment & Compatibility
Suitable replacement for a wide range of spa brands and models including:
- Signature Spas
- Spa Industries
- Spa-Quip wide mouth skim systems
- Trueform Spas
- Alpine Spas
- Cyclone Spas
- Pacific Spas
- Galaxy Spas
- Vortex and O2 models
- Oasis, Orbit, Gemini, Alpha, Meridian
- Jet Spas range and other compatible systems
Also used in various imported and aftermarket spa models with matching dimensions and thread type.
Dimensions
- Outside Diameter: 150mm
- Height: 204mm (can replace some 220mm cartridges)
- Top: Bar handle
- Bottom: 46mm SAE coarse thread
How It Works
Water is drawn through the pleated filter media, trapping debris like dirt, oils, and fine particles. This keeps the water cleaner and reduces load on the rest of the system.
Pro Tip
Buying two filters and rotating them during cleaning helps extend overall life. While one dries out fully, the other keeps the spa running.
FAQs
1. Is this a genuine Magnum WY45 filter?
Yes, this is a NZ-made Magnum WY45. Check the cap marking to confirm authenticity.
2. Will this fit my spa?
It fits a wide range of spas using Waterway 50 skim systems, but always confirm size and thread type before ordering.
3. Why is the WY45 so common in NZ?
It suits many spa brands and has become a standard replacement size across different models.
4. How often should I replace this filter?
Most spa filters are replaced every 12 months, depending on usage and water quality.
5. Can I clean and reuse the cartridge?
Yes. Regular rinsing will extend its life, but it should be replaced once performance drops.
6. Why is my water cloudy even after cleaning?
If cleaning does not help, the filter media is likely worn out and no longer trapping fine particles properly.