AmiBron Spa Filter Cartridge 30 sq.ft. Replacement 5-Pack — Fits Watkins & Unicel, Trilobal Pleated Media

AmiBron 71825 is a 30 sq.ft. pleated replacement spa filter cartridge compatible with Hot Springs/Watkins models, sold here as a convenient 5-pack for routine maintenance.

Keep your spa water clear and circulation efficient with this AmiBron-compatible replacement filter. Designed to match the dimensions and connection of popular OEM parts (Watkins 31489, Unicel C-6430, Pleatco PWK30 and others), the cartridge uses a trilobal pleated fabric to trap debris while still allowing good flow. Each cartridge measures approximately 10 1/2" long with a 6" outside diameter and 1 15/16" top/bottom openings, delivering about 30 square feet of filtration area per filter.

How does this filter fit different spa and hot tub models?

The AmiBron 71825 is engineered to be a drop-in replacement for a range of commonly used spa filters. It shares the same physical dimensions and port size as several OEM part numbers so you can swap it into existing filter housings without modification. Check the measurements on your old cartridge to confirm compatibility before ordering.

• Length: 10 1/2"; Outside diameter: 6"; Top/bottom opening: 1 15/16"
• Compatible references: Watkins 31489, Unicel C-6430, Pleatco PWK30
• Fits other listed part numbers used for cross-reference

What does the trilobal pleated fabric do for water quality?

The trilobal fabric structure increases surface area and creates more capture points for suspended particles while maintaining flow. This helps remove dirt, oils, and fine debris from spa water without choking off circulation. The result is clearer water and reduced load on your spa’s circulation system when filters are cleaned regularly.

• 30 sq.ft. of pleated filtration media per cartridge
• Trilobal fibers release trapped debris more easily during cleaning
• Improves particulate capture while preserving flow rate

How do I maintain and clean these AmiBron cartridges?

Routine cleaning extends filter life and keeps your spa performing well. Rinse filters every two weeks with a hose, and use a cartridge cleaner soak periodically to remove oils and scale buildup. With proper care, each cartridge typically lasts 1–2 years depending on usage and water chemistry.

• Rinse with high-pressure water between pleats every 2 weeks
• Soak in a neutral cartridge cleaner monthly or as needed
• Inspect for torn pleats or crushed end caps and replace if damaged

Is this AmiBron filter safe and certified?

The filter media used in this AmiBron cartridge is made from materials meeting NSF-related quality standards for pool and spa filter media. AmiBron manufactures this product as an independent compatible part; OEM names are provided only for cross-reference. Use approved cleaning agents and follow spa manufacturer guidelines for safe operation.

• NSF-certified filter materials for safe pool and spa use
• Sold as a compatible replacement — AmiBron is an independent brand
• Recommended maintenance schedule included to maximize service life

Who is this for: The AmiBron 71825 five-pack is ideal for hot tub and spa owners who want an affordable, high-surface-area replacement for common OEM cartridges. It suits hobbyists who perform regular filter maintenance, service technicians stocking parts, and anyone replacing worn or damaged filters with a direct-fit compatible option.