Aries (AF-20-2055-BB) 20"x4.5" Big Blue KDF-55 Filter
AF-20-2055-BB 20"x4.5" Big Blue KDF-55 Filter Cartridge
High-capacity dual-media filtration combining coconut shell GAC and KDF-55 redox media for whole-house chlorine removal, heavy metal reduction, and bacteriostatic protection
The Aries AF-20-2055-BB pairs ResinTech coconut shell granular activated carbon with KDF-55 redox media to deliver extended service life and comprehensive contaminant reduction in municipal whole-house applications. The 20" x 4.5" Big Blue footprint provides substantial media volume for flow rates and contact time that cartridge-style filters can't match. KDF-55 handles chlorine and water-soluble heavy metals through oxidation-reduction, while the activated carbon bonds organic chemicals and taste/odor compounds at the molecular level.
What the dual-media design delivers
KDF-55 Redox Process
Removes chlorine and reduces heavy metals through oxidation-reduction reactions, extending carbon life and preventing channeling
Coconut Shell GAC
ResinTech activated carbon bonds chlorine, VOCs, taste and odor compounds, and organic chemicals at the molecular level
Bacteriostatic Media
KDF-55 inhibits bacterial growth inside the filter, maintaining media integrity and preventing biofilm formation during service life
Big Blue Capacity
20" x 4.5" housing format provides high media volume for whole-house flow rates and extended contact time without pressure drop
Chloramine Capable
KDF-55 assists in chloramine breakdown when paired with catalytic carbon, making this cartridge suitable for challenging municipal supplies
Extended Service Life
The redox process preserves carbon capacity by handling chlorine independently, significantly extending replacement intervals compared to carbon-only filters
Housing and system fit
The Aries AF-20-2055-BB fits all standard 20-inch Big Blue housings with 4.5" inner diameter, including Pentek, Culligan, US Water, and generic brands using 1" NPT or 1.5" tri-clamp cap threads. Designed for whole-house municipal water treatment where chlorine removal, heavy metal reduction, and taste/odor improvement are required. Common installations include pre-treatment for tankless water heaters, whole-home point-of-entry systems, and commercial applications requiring high flow and extended media contact time. Pair with a 5-micron sediment prefilter to protect the media bed from particulate loading.
Aries FilterWorks manufactures specialty filter cartridges in the USA using premium ResinTech media and certified KDF redox alloys for consistent, reliable performance in demanding residential and light commercial applications.
AF-20-2055-BB 20"x4.5" Big Blue KDF-55 Filter Cartridge
High-capacity dual-media filtration combining coconut shell GAC and KDF-55 redox media for whole-house chlorine removal, heavy metal reduction, and bacteriostatic protection
The Aries AF-20-2055-BB pairs ResinTech coconut shell granular activated carbon with KDF-55 redox media to deliver extended service life and comprehensive contaminant reduction in municipal whole-house applications. The 20" x 4.5" Big Blue footprint provides substantial media volume for flow rates and contact time that cartridge-style filters can't match. KDF-55 handles chlorine and water-soluble heavy metals through oxidation-reduction, while the activated carbon bonds organic chemicals and taste/odor compounds at the molecular level.
What the dual-media design delivers
KDF-55 Redox Process
Removes chlorine and reduces heavy metals through oxidation-reduction reactions, extending carbon life and preventing channeling
Coconut Shell GAC
ResinTech activated carbon bonds chlorine, VOCs, taste and odor compounds, and organic chemicals at the molecular level
Bacteriostatic Media
KDF-55 inhibits bacterial growth inside the filter, maintaining media integrity and preventing biofilm formation during service life
Big Blue Capacity
20" x 4.5" housing format provides high media volume for whole-house flow rates and extended contact time without pressure drop
Chloramine Capable
KDF-55 assists in chloramine breakdown when paired with catalytic carbon, making this cartridge suitable for challenging municipal supplies
Extended Service Life
The redox process preserves carbon capacity by handling chlorine independently, significantly extending replacement intervals compared to carbon-only filters
Housing and system fit
The Aries AF-20-2055-BB fits all standard 20-inch Big Blue housings with 4.5" inner diameter, including Pentek, Culligan, US Water, and generic brands using 1" NPT or 1.5" tri-clamp cap threads. Designed for whole-house municipal water treatment where chlorine removal, heavy metal reduction, and taste/odor improvement are required. Common installations include pre-treatment for tankless water heaters, whole-home point-of-entry systems, and commercial applications requiring high flow and extended media contact time. Pair with a 5-micron sediment prefilter to protect the media bed from particulate loading.
Aries FilterWorks manufactures specialty filter cartridges in the USA using premium ResinTech media and certified KDF redox alloys for consistent, reliable performance in demanding residential and light commercial applications.
Original: $596.30
-65%$596.30
$208.70Description
AF-20-2055-BB 20"x4.5" Big Blue KDF-55 Filter Cartridge
High-capacity dual-media filtration combining coconut shell GAC and KDF-55 redox media for whole-house chlorine removal, heavy metal reduction, and bacteriostatic protection
The Aries AF-20-2055-BB pairs ResinTech coconut shell granular activated carbon with KDF-55 redox media to deliver extended service life and comprehensive contaminant reduction in municipal whole-house applications. The 20" x 4.5" Big Blue footprint provides substantial media volume for flow rates and contact time that cartridge-style filters can't match. KDF-55 handles chlorine and water-soluble heavy metals through oxidation-reduction, while the activated carbon bonds organic chemicals and taste/odor compounds at the molecular level.
What the dual-media design delivers
KDF-55 Redox Process
Removes chlorine and reduces heavy metals through oxidation-reduction reactions, extending carbon life and preventing channeling
Coconut Shell GAC
ResinTech activated carbon bonds chlorine, VOCs, taste and odor compounds, and organic chemicals at the molecular level
Bacteriostatic Media
KDF-55 inhibits bacterial growth inside the filter, maintaining media integrity and preventing biofilm formation during service life
Big Blue Capacity
20" x 4.5" housing format provides high media volume for whole-house flow rates and extended contact time without pressure drop
Chloramine Capable
KDF-55 assists in chloramine breakdown when paired with catalytic carbon, making this cartridge suitable for challenging municipal supplies
Extended Service Life
The redox process preserves carbon capacity by handling chlorine independently, significantly extending replacement intervals compared to carbon-only filters
Housing and system fit
The Aries AF-20-2055-BB fits all standard 20-inch Big Blue housings with 4.5" inner diameter, including Pentek, Culligan, US Water, and generic brands using 1" NPT or 1.5" tri-clamp cap threads. Designed for whole-house municipal water treatment where chlorine removal, heavy metal reduction, and taste/odor improvement are required. Common installations include pre-treatment for tankless water heaters, whole-home point-of-entry systems, and commercial applications requiring high flow and extended media contact time. Pair with a 5-micron sediment prefilter to protect the media bed from particulate loading.
Aries FilterWorks manufactures specialty filter cartridges in the USA using premium ResinTech media and certified KDF redox alloys for consistent, reliable performance in demanding residential and light commercial applications.
