Aries (AF-20-4202-BB) 20"x4.5" Big Blue Twin Bed Mixed Bed DI Filter
20"×4.5" Big Blue Twin Bed Mixed Bed DI Filter
Nuclear-grade deionization for ultra-pure water production in whole-house and industrial applications
Twin bed mixed resin technology removes dissolved solids to near-zero TDS
Mixed Bed Ion Exchange
Cation and anion resins work together to capture dissolved minerals, silica, and ionic contaminants that carbon and sediment filters miss
Ultra-Pure Output
Reduces total dissolved solids to less than 1 ppm for laboratory-grade water quality in residential and commercial settings
High Capacity Design
20 inch by 4.5 inch Big Blue format delivers commercial-grade flow rates and resin volume for demanding whole-house applications
Post-RO Polishing
Ideal as final stage after reverse osmosis systems to eliminate residual TDS and achieve pharmaceutical-grade purity
Fits standard 20 inch Big Blue housings
The Aries AF-20-4202-BB installs in any standard 20"×4.5" Big Blue filter housing with 1" or 1.5" ports. Commonly used in whole-house systems, aquarium applications, boiler feed water, and as final polishing stage after RO membranes. Works with Pentek, Hydronix, Culligan, and other brands using Big Blue 20 inch format.
Replace based on TDS monitoring
Typical Lifespan
Service life depends on incoming TDS levels and water volume. Monitor output with TDS meter and replace when readings exceed acceptable threshold.
TDS Testing
Use digital TDS meter to track output quality. Replace filter when output rises above 2–3 ppm or 10% of resin exhaustion point.
Extend Resin Life
Install sediment and carbon pre-filters upstream. Feed DI filter with RO permeate when possible to maximize resin capacity and lifespan.
Zero TDS Target
Removes dissolved minerals to near-zero for spot-free rinsing and sensitive applications
Drop-In Replacement
Standard Big Blue 20×4.5 sizing fits existing whole-house filter housings
Aries Quality
Made by Aries Filter Works with high-grade ion exchange resins for consistent performance
Lab-Grade Purity
Produces pharmaceutical and electronics-grade water when used with proper pre-treatment
20"×4.5" Big Blue Twin Bed Mixed Bed DI Filter
Nuclear-grade deionization for ultra-pure water production in whole-house and industrial applications
Twin bed mixed resin technology removes dissolved solids to near-zero TDS
Mixed Bed Ion Exchange
Cation and anion resins work together to capture dissolved minerals, silica, and ionic contaminants that carbon and sediment filters miss
Ultra-Pure Output
Reduces total dissolved solids to less than 1 ppm for laboratory-grade water quality in residential and commercial settings
High Capacity Design
20 inch by 4.5 inch Big Blue format delivers commercial-grade flow rates and resin volume for demanding whole-house applications
Post-RO Polishing
Ideal as final stage after reverse osmosis systems to eliminate residual TDS and achieve pharmaceutical-grade purity
Fits standard 20 inch Big Blue housings
The Aries AF-20-4202-BB installs in any standard 20"×4.5" Big Blue filter housing with 1" or 1.5" ports. Commonly used in whole-house systems, aquarium applications, boiler feed water, and as final polishing stage after RO membranes. Works with Pentek, Hydronix, Culligan, and other brands using Big Blue 20 inch format.
Replace based on TDS monitoring
Typical Lifespan
Service life depends on incoming TDS levels and water volume. Monitor output with TDS meter and replace when readings exceed acceptable threshold.
TDS Testing
Use digital TDS meter to track output quality. Replace filter when output rises above 2–3 ppm or 10% of resin exhaustion point.
Extend Resin Life
Install sediment and carbon pre-filters upstream. Feed DI filter with RO permeate when possible to maximize resin capacity and lifespan.
Zero TDS Target
Removes dissolved minerals to near-zero for spot-free rinsing and sensitive applications
Drop-In Replacement
Standard Big Blue 20×4.5 sizing fits existing whole-house filter housings
Aries Quality
Made by Aries Filter Works with high-grade ion exchange resins for consistent performance
Lab-Grade Purity
Produces pharmaceutical and electronics-grade water when used with proper pre-treatment
Original: $234.43
-65%$234.43
$82.05Description
20"×4.5" Big Blue Twin Bed Mixed Bed DI Filter
Nuclear-grade deionization for ultra-pure water production in whole-house and industrial applications
Twin bed mixed resin technology removes dissolved solids to near-zero TDS
Mixed Bed Ion Exchange
Cation and anion resins work together to capture dissolved minerals, silica, and ionic contaminants that carbon and sediment filters miss
Ultra-Pure Output
Reduces total dissolved solids to less than 1 ppm for laboratory-grade water quality in residential and commercial settings
High Capacity Design
20 inch by 4.5 inch Big Blue format delivers commercial-grade flow rates and resin volume for demanding whole-house applications
Post-RO Polishing
Ideal as final stage after reverse osmosis systems to eliminate residual TDS and achieve pharmaceutical-grade purity
Fits standard 20 inch Big Blue housings
The Aries AF-20-4202-BB installs in any standard 20"×4.5" Big Blue filter housing with 1" or 1.5" ports. Commonly used in whole-house systems, aquarium applications, boiler feed water, and as final polishing stage after RO membranes. Works with Pentek, Hydronix, Culligan, and other brands using Big Blue 20 inch format.
Replace based on TDS monitoring
Typical Lifespan
Service life depends on incoming TDS levels and water volume. Monitor output with TDS meter and replace when readings exceed acceptable threshold.
TDS Testing
Use digital TDS meter to track output quality. Replace filter when output rises above 2–3 ppm or 10% of resin exhaustion point.
Extend Resin Life
Install sediment and carbon pre-filters upstream. Feed DI filter with RO permeate when possible to maximize resin capacity and lifespan.
Zero TDS Target
Removes dissolved minerals to near-zero for spot-free rinsing and sensitive applications
Drop-In Replacement
Standard Big Blue 20×4.5 sizing fits existing whole-house filter housings
Aries Quality
Made by Aries Filter Works with high-grade ion exchange resins for consistent performance
Lab-Grade Purity
Produces pharmaceutical and electronics-grade water when used with proper pre-treatment
