Inline Post-Carbon Polishing Filter (2” × 6”) – Compatible with Culligan AC-30, AC-15 & LC-50 RO Systems

Designed to fit select Culligan reverse osmosis systems, including the AC-30, AC-15, and LC-50. Installed as the final stage of filtration, it polishes RO water before dispensing, improving taste and odor.

This filter is commonly referred to as the post-carbon or polisher filter and is responsible for giving RO water a clean, neutral taste at the faucet.

What It Improves

Final taste and odor of RO water

Removes any remaining carbon fines

Polishes water after RO membrane filtration

Why the Post-Polishing Filter Matters

After water passes through the RO membrane, a post-carbon filter:

Enhances overall taste and drinking quality

Ensures consistent, clean output at the faucet

Acts as the final quality control stage in the system

This stage does not affect TDS reduction, but it plays a key role in how the water tastes.

System Compatibility

This inline post-carbon filter is compatible with Culligan RO systems that use a 2" × 5" inline post filter, including:

Culligan AC-30

Culligan AC-15

Culligan LC-50

Compatibility Notice:
This is a compatible replacement filter manufactured by LiquaGen. It is not an OEM product and is not manufactured, endorsed, or affiliated with Culligan.

Specifications

Filter Type: Inline post-carbon polishing filter

Size: 2" × 6"

Filtration Stage: Final stage (post-carbon)

Inlet Size - 3/8" Push Connect 

Application: Reverse osmosis systems

Function: Taste and odor improvement

Recommended Replacement: Every 12 months or as needed

When to Replace

Replace once per year

Replace sooner if taste or odor changes are noticed

Regular replacement ensures consistent water quality and taste.

Why Choose This Filter

Designed to match original Culligan post-filter dimensions

Improves drinking water taste without affecting flow

Simple inline installation with standard quick-connect fittings