VIQUA C2-02 Carbon Block Filter 10 Micron 4.5" x 20"

Better-tasting water and a UV system that works the way it should

The VIQUA C2-02 is the OEM factory replacement carbon block cartridge for VIQUA and Sterilight integrated UV systems. It does two jobs at once.

First, it filters. The carbon block is rated at 10 microns, so it captures the sand, silt, rust flakes, and scale particles that cloud your water. That matters for more than clarity: suspended particles can shade bacteria from UV light and coat the quartz sleeve, which quietly reduces how well your UV system disinfects. A clean pre-filter protects that performance.

Second, it polishes. The activated carbon adsorbs chlorine, chlorine taste, and odors — up to 40,000 gallons of chlorine reduction at 4 GPM.  

Compatible Systems

The VIQUA C2-02 is the genuine replacement carbon block filter for a wide range of VIQUA and Sterilight integrated UV systems. It fits the VIQUA VH410-F12 and VH410-F22, as well as the VIQUA IHS Series models IHS12-D4, IHS22-D4, and IHS22-E4. It is also the correct carbon block for the VIQUA S12Q-WHSC whole home system.

On the Sterilight side, the C2-02 replaces the carbon block in the SC320 Series systems SC320-DWS12 and SC320-DWS22, along with the SCM320 Series systems SCM320-DWS12 and SCM320-DWS22. Because it uses the standard 4.5" x 20" cartridge form factor, the C2-02 also fits most conventional 20-inch "Big Blue" filter housings, making it a practical carbon stage for whole house systems outside the VIQUA lineup. If you are unsure which cartridge your system takes, check the model number on the label of your UV unit against the list above.

Genuine VIQUA — not a generic substitute

This is an OEM VIQUA cartridge built to the exact dimensions and flow characteristics of your system's housing. Aftermarket blocks in the same nominal size can seat poorly, restrict flow, or bypass around the gasket. This one drops in.

Key Features 

• Genuine VIQUA OEM cartridge — exact-fit replacement, part number C2-02 (also referenced as 155783-43 and EMP-20)
• 10-micron carbon block — reduces sediment, dirt, rust, and scale particles
• Chlorine, taste, and odor reduction — up to 40,000 gallons at 4 GPM
• Standard 4.5" x 20" Big Blue size — fits VIQUA integrated systems and most 20-inch big-blue housings
• Flow to 10 GPM (38 LPM) maximum
• The carbon block does not disinfect. Microbiological treatment is the job of the UV lamp; the C2-02 protects and supports it.
• NSF/ANSI 42 certified for aesthetic effects
• Protects your UV system — cleaner water means better UV transmittance and a cleaner quartz sleeve
• 6–12 month service life, depending on water quality and usage