Upper & Lower Spa Filter Cartridges - Sapphire, Signature & Others - Top & Bottom
Product is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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Top & Bottom cartridge filters for Sapphire, Signature, Spa Industries Bullfrog and other swim spas using the widemouth filters. Found on many brands swimspas that have 4 filters. Bottom half has a coarse thread, where the top filter has kind of a twist lock. See photos.
We also have the Microban version of these filters listed here.
Details / Dimensions:
- Replaces SG100, RFIL15050M, RFIL15050F, AFILK25MFS on V-Stream and others.
- 425mm or 460mm overall height combined height (upper and lower) excluding D handle and threaded spigot. New version is shorter in length to fit more spas, but has same surface area of taller version, and has more pleats.
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Top Filter: 210-225mm H x 145-150mm OD x closed top x 44-53mm OD smooth spigot bottom
- Bottom Filter: 220-225mm H (incl. crown) x 145-150mm OD x open crown top @ 44mm ID x 47-50mm OD ACME SAE threaded spigot bottom
- D handle closed top with smooth spigot bottom to slip inside top of the LOWER cartridge. Early ones had a square handle.
More Information:
- Physically kept in stock, unlike many "Drop-shipping" websites.
- Shipped Fast
- Pick-Up Available - (Please Order Online or Contact us first)
Upper & Lower Spa filter cartridge PAIR - suits 100 and 200 sqft Front Access Skim Filters 817-0011
Waterway skim filter UPPER and LOWER cartridge pair used in Front Access skim filters with 2 cartridges on top of each other ( single for 100 sqft, and wide mouth double, for 200 sqft)
These are not cheap, poor quality filters found elsewhere. They are OEM quality using USA made Reemay or Darlly filter material.
Filters should be replaced 1-2 years.
MSG100-k SS50T SS50B FC-SS50T FC-SS50B Unicel 6CH-942
Premium Quality. Trusted Brands. No Gimmicks.
Heater & Spa Parts only supplies premium-grade filter cartridges — no cheap Chinese generics, no rebranded knock-offs, and no gimmicks. Our filters are trusted by major spa and pool brands including Astralpool, Balboa, Davey, Halo Spas, Hurlcon, Oasis Spas, Sapphire Spas, Spa World, Vortex®, SpaNet, Waterco, Zodiac and more.
These aren’t your cheap filters sold on eBay, Wish, Temu, or Amazon. They are the same filters used by top manufacturers. Because we buy in container-load volumes, we’re able to offer the same high-end filters at a much better price — and pass those savings on to you.
NSF® Certified for Safety and Performance
All our filters are made from NSF® certified materials — meeting international standards for safety, strength, and water filtration performance. Brands like Darlly®, Magnum®, Pleatco®, and Reemay® are globally recognised for quality and reliability. If leading spa and pool equipment manufacturers rely on them, so can you.
Why We Use Darlly® and Magnum® Filters
Unless otherwise specified, we supply filters from Darlly® and Magnum®, made with advanced media from Reemay® or equivalent. These filters offer:
- Stronger, continuous fibres for minimal shedding
- Greater durability compared to cheap alternatives
- Longer life and fewer replacements
- Cleaner, healthier water
Low-quality filters often shed fibres that clog or damage equipment. Ours are engineered to avoid that — keeping your spa or pool clean and efficient.
Filter Cleaning Guide
Proper maintenance extends the life of your cartridge and keeps water quality high. Clean your filter when:
- Spas: Water flow or jet pressure drops
- Pools: Filter pressure is ~35kPa higher than normal
How to Clean Your Filter
- Remove the cartridge per manufacturer instructions
- Soak it in a cleaning solution (e.g., Zodiac Filter Soak or Filter Klenz)
- Rinse thoroughly with a garden hose — pleat cleaning nozzles help
- Reinstall the filter carefully
Maximise Filter Life
- Maintain balanced water chemistry
- Clean regularly based on system usage
- Do not scrub with hard brushes or use high-pressure hoses
- Avoid using flocculants and overusing clarifiers
- Rotate multiple cartridges to extend lifespan
When to Replace Your Filter
We recommend replacing your filter every 12 to 24 months depending on usage and conditions. Keeping a spare on hand allows for uninterrupted filtration and longer lifespan through rotation.
Warranty Information
All standard filters are covered by a 12-month replacement warranty (excluding disposable/inflatable types). This covers defects in materials or workmanship, not damage from improper use or poor water chemistry. See examples and warranty terms here.
In Summary: Why Choose Our Filters?
- NSF® certified materials for proven safety and performance
- Used by major brands – AstralPool, Balboa, Davey, Halo Spas, Hurlcon, Oasis Spas, Sapphire Spas, Spa World, SpaNet, Waterco, Zodiac
- Made by Darlly®, Magnum®, Pleatco® – not unknown generics
- No gimmicks – just reliable, proven filtration
- Engineered for Australian conditions – reliable year-round
Your spa or pool deserves more than a “just good enough” filter. Choose proven quality, backed by trusted names and expert knowledge.
Want to Know More? Read More...
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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