AmiBron 30 sq.ft. Pleated Spa Cartridge Filter 10.5" x 6" — 5-Pack, Trilobal Media for Hot Tubs

AmiBron 71825 is a 30 sq.ft. pleated spa cartridge filter designed to replace Hot Springs and other common spa filter part numbers, sold here as a five-pack for routine maintenance.

This compatible replacement cartridge fits a wide range of spas and hot tubs that accept a 10.5" long filter with a 6" outside diameter and 1 15/16" top/bottom openings. Constructed from trilobal pleated filter media, the cartridge is made to trap debris effectively while remaining simple to rinse clean. AmiBron supplies these as aftermarket spares; referenced brand names and part numbers are included only for fit guidance.

Will this filter fit my Hot Springs or Watkins spa?

If your spa currently uses filters labeled Watkins 31489, Unicel C-6430, Pleatco PWK30, Filbur FC-3915 or the similar part numbers listed by manufacturers, this AmiBron cartridge is engineered to be a compatible replacement. Check the physical measurements on your existing cartridge to confirm proper fit before purchasing.

• Length: 10 1/2 inches (approx. 26.7 cm)
• Outside diameter: 6 inches
• Top and bottom opening diameter: 1 15/16 inches
• Filtration surface area: 30 sq. ft.

How effective is the AmiBron trilobal pleated media?

The cartridge uses a trilobal fiber weave that increases surface area and captures a broad range of particles without overly restricting flow. The pleated design balances filtration efficiency with serviceability, making rinsing and reconditioning practical for regular upkeep.

• Trilobal fabric structure for improved contaminant capture
• Large pleated surface area reduces pressure drop
• Designed for rinsing to restore performance between replacements

How should I maintain and how long will these filters last?

Routine cleaning extends the life of each cartridge: rinse debris every one to two weeks and deep-clean as needed with a filter cleaner. With appropriate maintenance, each filter commonly serves one to two years depending on usage, water chemistry and loading from nearby debris sources.

• Rinse with a hose to remove surface debris
• Use a dedicated filter cleaner periodically for a deeper clean
• Inspect for tears, crushed pleats, or permanent staining—replace when performance drops

Is this product certified and safe to use in spas?

AmiBron cartridges are manufactured from materials that meet NSF-related quality standards for pool and spa filter media, helping ensure reliable filtration performance. As an aftermarket cartridge, AmiBron is an independent brand and not an OEM part; compatibility is indicated for reference only.

• NSF-certified filter material for peace of mind
• Sold as a five-pack to simplify routine replacements
• Compatible with many common OEM part numbers for easy swap-in

Who is this for: Owners of Hot Springs, Watkins, and other compatible spa systems looking to keep water clear without the OEM price tag. Ideal for homeowners who perform their own hot tub maintenance and prefer buying filter cartridges in multi-packs to keep a ready supply for seasonal cleanings and timely replacements.