OEM Universal Coarse Thread Spa Cartridge Filter - 50ft² Filter Element
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Darlly® by SpaCraft® Semi-Universal OEM Coarse-Threaded Spa Filter Cartridge – 50ft². Suitable for use with many Aquapulse, Bunnings, Cyclone, Designer, Eclipse, Endless®, Escape, Fisher, Getaway, H2O, Heritage, Lanark, Leisurerite, Lifestyle, Oasis®, Poolwerx, Sapphire®, Signature, Spa Industries, Spas Direct, Spas For Life, and other spas.
Not all brands and models are listed, but many are below. It's best to compare measurements and/or send us a photo if unsure.
Why Choose This Filter?
- OEM quality – not cheap eBay/Amazon imitations
- Bulk direct-from-manufacturer supply – better value passed on to you
- Physically in stock – available for pickup or fast shipping
- Trusted performance – widely used since the early 2000s
This is a high-quality OEM coarse-thread filter cartridge. Compatible with a wide range of spa brands, this cartridge is made with premium USA-made filter media from Darlly Reemay and Magnum.
Specifications
- Length: ~205mm (previously measured from 205mm to 225mm). New version now fits a wider range of spas
- Diameter: 145–150mm
- Thread: 47–49mm ACME Coarse Thread
- Top: Closed – D-Shape or Square Handle
- Material Options: Available in standard white or Microban® (blue) antimicrobial filter material.
This filter replaces a wide range of part numbers from leading brands like Pleatco, Unicel, Filbur, Darlly, American Spas, Apollo, Arcadia, Viking, and more.
Examples of part numbers this replaces:
Pleatco PWW50P3, Unicel 6CH-940, Filbur FC-0359, Darlly 60401, 03FIL1400, 817-0050, PWW50, WY45, RFILA15025, RFILA15050, RFIL150505, FCD226, 4504RS, RFILA1525B, AFILK2525F, WW50S, MWY45, SG50, FC-FCD226, FC-FCD236, SS50, RFILWAT50T, and others.
Popular Spa Models This Filter Fits:
Aquapulse: Most models except Trinity & Eden
Cyclone: Breeze, Force, Monsoon, Storm, Tempest, Tornado, Twister, Typhoon, Whirlwind, Zephyr
Endless: Universe, Grande, Innovator, Relaxer, Super Swim series
Eclipse: Tempest, Twister, Zephyr series
Designer: Atlantic, Azure, Cascade, Colorado, Lagoon, Milan, Regatta, Riviera, Tasman, Titan, Trinity, X-Stream
Getaway: Anglesea, Bondi, Coolum, Flinders, Long Island, Noosa, Portsea, Sorrento, Whistler, Whitehaven
Heritage: Apollo, Recliner, Regency, Rio, Riverside
Lanark: Atlantic Swim Spa, Byron Bay, Cantwell Bay, Corio Bay, Coronet Bay, Crystal Bay, Diamond Bay, Jarvis Bay, Pacific Swim Spa, Pearl Bay, Summer Bay, Victoria Bay, Waratah Bay series
Leisurerite: Aztec, Elite Octagon, Manhattan, Sahara, Swim Stream, Venetian (most pre-2019)
Oasis: Pacific Hydro
Sapphire: Most models
Signature: Big Sir, Miami, Millennium, President, V-Stream
Spa Industries: Fiji, Mercury, Maui, Grand, Titan, Heat, Hydro
Bunnings: Mandalay Bay, Venetian
Poolwerx: Motion
Spas For Life: Relaxer
This semi-universal filter cartridge offers reliable performance, long lifespan, and broad compatibility, making it a trusted replacement across hundreds of spas in Australia and beyond.
These aren’t your typical "cheap" filters found on sites like eBay, Wish, Temu, or Amazon.
Top brands like Davey, Waterco, Astralpool, Zodiac, Sapphire, and more use these exact filters - but with significant markups.
By purchasing in the container-load, we’re able to offer the same high-quality filters at a fraction of the cost—passing the savings directly to you!
About Our Filters:
We primarily use filters made by Darlly and Magnum unless specified otherwise. These filters incorporate high-quality Reemay/Darlly/Magnut filter material, which is stronger and more durable compared to competitors.
The superior durability of Reemay/Darlly/Magnum filters leads to cleaner water, fewer replacements, and lower long-term costs, allowing you more time to enjoy your pool or spa.
Cheaper filters often have fibers that can break apart and enter the system, potentially causing issues. Reemay/DarllyMagnum filters use continuous fibers, significantly reducing the risk of breakage and loss, ensuring your system stays clean and efficient.
Caring for Your Reemay/Darlly/Magnum Cartridge Filter:
Reemay/Darlly/Magnum filters are known for their strength and durability, making them easy to maintain. Cleaning is simple!
Filters should be cleaned anywhere from every 2 weeks to 6 months, which totally depends on how much work your filter is doing.
- Spas: You'll know it's time to clean your filter either when water flow and pressure seems reduced at your spa or pool jets.
- Pools: Many cartridge filter manufacturers recommend you clean filters when the pressure gauge is around 35kPa above it's normal operating pressure. Replace faulty pressure gauges regularly.
How to Clean Your Filter Cartridge:
- Remove the cartridge from the housing, following the manufacturer’s instructions.
- Soak the filter in a degreasing solution to remove oils, lotions, and other debris. Examples: Zodiac Filter Cleaner Soak or Filter Klenz Spray
- Rinse thoroughly with a garden hose from both the inside and outside, ensuring you clean between all the pleats. These nozzles are handy!
- Reinstall the cartridge in the housing, again following the manufacturer's guidelines.
Things you can do to maximise the life of your filter:
- Maintain the pool water chemistry in proper balance.
- Clean the cartridge in accordance with its cleaning instructions.
- Do not scrub the filter with a stiff brush.
- Do not use a high pressure hose.
- Do not use flocculants or overuse clarifiers.
- Rotate multiple cartridges to prolong the life of the filters considerably.
Replacement Time:
Filters should be replaced every 1-2 years to maintain optimal performance.
It's a great idea to keep a spare or two for easy changeovers!
Warranty:
12-month Replacement Warranty on most filters other than the disposable & inflatable types. Warranty does not cover damage due to improper use or water balance issues. See here for examples.
Measuring a cartridge filter element when you dont have the exact model is the best way to identify it. There are a few important measurements, and they need to be as accurate as possible.

Total Length: Length of the filter, excluding the handle. You can generally also exclude the spigot or thread.

Diameter: This is the width of the filter.

Spigot Diameter: You may have a male threaded, or non-threaded spigot to locate the filter.
Hole Diameter: If you have a hole, rather than a spigot, measure the diameter of the hole.

Thread / Hole Type: Generally these can be a hole, a fine thread, course thread, or camlock style fitting.

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