Inline DI Mixed Bed Deionization Filter

NSF Certified | Made by Omnipure (USA)

The Inline DI Mixed Bed Deionization Filter (Model K2555-BB) is designed to produce
deionized, ultra-pure water by removing dissolved ionic contaminants that remain after
reverse osmosis filtration. Filled with high-quality mixed-bed deionization resin, this filter helps reduce
ions such as sodium, calcium, iron, and copper.

This filter is commonly used as a post-RO polishing stage in countertop reverse osmosis
systems and is ideal for applications requiring very low TDS water.

Purpose

• Produces deionized (ultra-pure) water
• Reduces dissolved ionic contaminants after RO filtration
• Final polishing stage for specialty water applications

Key Features

• NSF Certified
• Manufactured by Omnipure (USA)
• Filled with premium mixed-bed deionization resin
• Inline sealed housing prevents resin leakage
• Easy installation with standard RO tubing

Applications

• Countertop reverse osmosis systems
• Aquarium and reef systems
• Specialty home filtration applications
• Laboratory and technical water use

Installation

Designed for use as a stage in countertop reverse osmosis systems.
Typically installed immediately after the RO membrane stage.

Included

• Inline DI mixed bed filter (2″ × 10″)
• 2 quick-connect elbow adapters (1/4″ thread)

Specifications

• Filter Type: Inline Deionization (DI) Mixed Bed
• Model: K2555-BB
• Connection: 1/4″ FPT
• Flow Rate: 0.50 GPM
• Capacity: 125 grains
• Operating Temperature: 36°F – 100°F
• Max Pressure: 125 PSI
• Micron Rating (Nominal): Not rated

SKU: K2555-BB

🔧Installation Tips

Tubing Size

• Most RO systems use 1/4″ OD tubing (standard RO size).
• Some countertop RO systems and specialty setups use 3/8″ OD tubing.
• Tubing size refers to the outside diameter (OD) of the tube.

When Do You Need Elbow Adapters?

• Select 3/8″ OD Tubing if your system uses larger tubing.
• We include 2 elbow adapters to connect the inline filter to 3/8″ OD tubing.

✔ No tools required
✔ Push-to-connect installation

When Do You Need a T-Fitting?

A T-fitting (1/4″ stem x 1/4″ OD Tubing x 1/4″ OD Tubing) is helpful if you are:

• Adding the inline filter to an existing 1/4″ RO line
• Want an easier install with a clean branch connection
• Installing between tubing lines without reworking your layout

✔ Optional accessory
✔ Makes installation easier for some setups

Not Sure Which Option to Choose?

• If unsure, select Universal Fit option (Included 4 elbow adapters for 1/4″ & 3/8″ OD Tubing Connection)
• Message us before ordering—we’re happy to help you pick the right fittings.

▶️ Video Installation Guidance

Because RO systems and plumbing layouts can vary, there are multiple valid ways to install an inline filter.

If you are unsure about your setup, we recommend:

• Searching YouTube for “inline RO filter installation”
• Watching a video that best matches your system type
  (under-sink RO, countertop RO, post-filter installation, etc.)

Visual step-by-step videos can be very helpful and often make installation easier and faster.