What Is DI Resin?

The DI resin 5 L bag provides high-quality deionization resin for the final polishing stage in RO systems. After RO removes most contaminants, this resin removes remaining ions such as calcium, magnesium, phosphate, silicate, and nitrate. By exchanging them for hydrogen (H⁺) and hydroxide (OH⁻) ions, it ensures almost zero TDS in the treated water.

Also, the DI resin 5 L is easy to use and compatible with standard DI housings or larger tanks. Consequently, it is perfect for aquariums, laboratories, and industrial applications.

Key Features

• High Purity Water: Achieves very low TDS levels.
• Ion Exchange Structure: Gel-type styrene/DVB polymer resin ensures reliable ion exchange.
• Color-Changing Indicator: Changes color when saturated, making it easy to know when to replace.
• Long Shelf Life: Bagged to avoid air exposure and preserve capacity.
• Secure Packaging: Prevents contamination and moisture before use.

How DI Resin Works

First, water from the RO system enters the DI chamber. Then, the resin exchanges remaining cations (positive ions) for H⁺ and anions (negative ions) for OH⁻. As a result, the water becomes ultra-pure.

In addition, when the resin becomes exhausted, the color changes. Therefore, you can monitor performance easily and replace the resin on time. This reduces downtime and ensures consistent water quality.

Benefits

• Ultra-Pure Water: Perfect for labs, aquariums, or industrial processes.
• Easy Monitoring: Color-change feature signals resin exhaustion.
• Cost-Effective: A 5 L bag saves money compared to small cartridges.
• Flexible Use: Works with DI tanks and standard housings.
• Safe to Use: High-quality resin, when rinsed properly, is safe for water systems.

Ideal Applications

• RO/DI systems for ultra-pure water
• Laboratory water purification
• Spot-free rinse systems for cars or glassware
• Electronics or semiconductor manufacturing
• Any setup requiring very low TDS water

Usage & Maintenance Tips

• Flush before use: Rinse resin to remove fines.
• Pack tightly: Prevent channeling in the DI chamber.
• Monitor TDS: Replace resin when TDS rises or color changes.
• Seal unused resin: Keep unused resin airtight to prevent degradation.

Specifications:

• Polymer Structure: Styrene/DVB
• Base Type: Strong
• Polymer Type: Gel
• Functional Group: Trimethylamine
• Physical Form: Spherical Beads
• Ionic Form (as shipped): Hydroxide
• Total capacity: >1.0 meq/mL (OH Form)
• Water Retention: 55 to 60 percent (OH Form)
• Screen Size Distribution: 16 to 50 (U.S. Mesh)
• Maximum Fines Content: 1 percent (less than 50 Mesh)
• Minimum Sphericity: 93 percent
• Uniformity Coefficient: 1.6 (Approximate)
• Resin Color: Blue

To get maximum life from your DI resin please takes the following steps

• Ensure the optimal operation of your RO membrane. The higher your membranes rejection rate the fewer TDS your product water will contain resulting in longer-lasting resin. The best way to keep the membrane rejection rate up is to monitor and change your prefilters appropriately as well as maintain at least 50psi going into the membrane.
• Ensure the resin is packed in the cartridge securely. The resin should be packed very tightly. When squeezed, there should be almost no flex to the cartridge.
• The initial couple minutes of water from your RO membrane will always be high, this is commonly referred to as TDS creep. Diverting the first few minutes of water down the drain can often greatly reduce DI resin consumption.
• Maintain low levels of carbon dioxide in your water supply. Excess carbon dioxide will deplete DI resin quickly. If you are depleting resin quickly and have already: addressed the two options above, excess carbon dioxide is the likely culprit. You have two choices:
  • Collect the water coming from your RO system in a large container, add a powerhead or airstone, and allow the CO2 to gas off. Then pump the water through your DI resin.
  • Skip all that mess and just buy resin in bulk.

Common Contaminants: