Description
Overview
Magnum C50 spa filter cartridge is a New Zealand made replacement designed to suit selected Pacific Spa systems. It is a straight swap for worn or clogged cartridges and is built for regular spa use, not just light-duty weekends. If your spa water is getting harder to keep clear or flow has dropped off, chances are the filter is due.
Magnum filters are widely used across NZ because they hold their shape, clean well, and cope with regular rinsing without breaking down early.
Where It Fits
This cartridge suits some Pacific Spa models. Always check the measurements below against your existing filter before ordering, as spa brands often use similar names with different sizes.
If your old filter matches these dimensions, this is the correct replacement.
Key Details
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New Zealand made Magnum filter cartridge
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Designed for spa and pool circulation systems
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Easy drop-in replacement
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Suitable for regular cleaning and reuse
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Built for steady flow and consistent filtration
Specifications
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Outside diameter: 152 mm
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Length: 263 mm
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Inside diameter: 50 mm
When to Replace
Most spa filters need replacing every 12 months depending on use, water balance, and how often the cartridge is cleaned. If the pleats stay dirty after rinsing, or the end caps are starting to soften or crack, it is time to replace it.
Running a tired filter makes the pump work harder and usually leads to cloudy water that never quite clears.
Installation Notes
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Switch the spa off before removing the old cartridge
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Rinse the housing before fitting the new filter
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Hand-tighten only if the system uses a threaded mount
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Prime the system and check flow after restart
No tools needed for most installs.
FAQs
Is this a genuine Magnum filter?
Yes. This is a New Zealand made Magnum filter cartridge.
Will this fit all Pacific Spas?
No. It fits some Pacific Spa models only. Always match the measurements with your existing filter.
How often should I clean it?
Rinse every 2 to 4 weeks depending on use. A deeper clean every few months helps extend its life.
Can I use this in a pool system?
This cartridge is designed for spa systems. Pool systems usually require larger cartridges.
What happens if I run a blocked filter?
Flow drops, pumps strain, and water quality suffers. Replacing the filter early avoids bigger issues later.