Hot Tub Things® 880™ & 780™ Series MicroClean Ultra II Inner Filter Cartridge (2024+) 6473-453S
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Key Features & Benefits
Perfect Fit Guaranteed
Designed to match OEM specifications for Sundance® 6473-453S, ensuring a precise and secure fit. This exact compatibility allows for seamless installation and dependable filtration performance.
Superior Filtration Performance
Engineered for seamless compatibility with original mounting points for secure placement.Captures fine particles and debris to help maintain crystal-clear, healthy spa water. High-efficiency media improves overall water quality while reducing the need for excess chemicals.
Extended Filter Lifespan
Constructed from durable, chemical- and UV-resistant materials that withstand harsh spa conditions. Built for longevity, delivering reliable performance through repeated cleaning cycles.
Quick & Easy Installation
Simple drop-in replacement design requires no tools or modifications. Swap out your old filter in seconds and get back to enjoying your spa.
Optimized Water Circulation
Engineered to maintain proper flow rate for efficient heating and even chemical distribution. Consistent circulation supports balanced water chemistry and better spa performance.
Cost-Effective Performance
Provides OEM-level quality and filtration at a more affordable price point than dealer alternatives. Reliable construction helps reduce long-term maintenance costs and equipment wear.
Product Overview
Hot Tub Things® MicroClean Ultra II Inner Filter Cartridges are engineered to fit Sundance® 880 Series spas (2024 and later) and select 780 Series 2026 models equipped with MicroClean Ultra II or MicroClean Ultra II Lite, cross-referencing OEM part number 6473-453S. As the fine-filtration inner core of Sundance's two-part system, this pleated cartridge is designed to sit inside the matching outer cartridge and trap the smaller particles the outer stage lets through.
This is a disposable inner component meant to be replaced rather than deep-cleaned, and it installs in seconds without tools — remove the old inner core from inside the outer cartridge, insert the new one, and reinstall the assembly. It's built with durable pleated polyester filtration media to maximize surface area for strong water flow.
Regular replacement on a 12-18 month cycle (adjusted for your actual usage and water care) helps reduce strain on your spa pump and heater, prevents cloudy or discolored water, and extends the life of your hot tub equipment. For 880 and select 780 Series owners, this is a fit-verified aftermarket replacement without dealer pricing.
Frequently Asked Questions
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Replace your Sundance® filter every 12-18 months for optimal performance. If you use your spa frequently or notice reduced water clarity, consider replacing it sooner.
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This filter is designed specifically for Sundance® spas that use the 6473-453S cartridge. Check your spa's manual or existing filter for the part number to confirm compatibility.
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Our Hot Tub Things® filter meets or exceeds OEM specifications at a more affordable price. You get the same quality filtration, perfect fit, and reliable performance without the dealer markup.
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Rinse your filter weekly with a garden hose. Monthly, soak it in a filter cleaning solution to remove oils and minerals. Replace the filter annually for best results.
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A worn or clogged filter reduces water circulation, strains your pump, increases chemical usage, and can lead to cloudy or contaminated water. Regular replacement protects your investment.
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This filter is engineered specifically for Sundance® spas using part number 6473-453S. For other brands like Bullfrog or Jacuzzi, browse our Hot Tub Filters collection to find the right match.
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This inner filter pairs with outer filter 6473-452S to form the complete two-piece assembly (6541-964S); an alternate pleated-only version is listed as 6541-965S. It fits the current 880 Series lineup (Altamar, Aspen, Cameo, Capri, Marin, Optima, Vistamar) from the January 2024 redesign forward. If you have a 780 Series spa, please confirm your exact model year and existing filter part number with our support team before ordering, since 780 Series MicroClean fitment can vary by production date.
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