GrowMax Water Deionization (DI) 20" Filter Cartridge for use with DI KIT 20"

The GrowMax 20" deionization filter cartridge is the perfect replacement cartridge for the GrowMax DI Kit 20" . It removes all remaining dissolved substances from the water to achieve an electrical conductivity (EC) of 0 ppm .

For demanding applications

This cartridge is ideal for aquariums, hydroponic systems, sensitive plant cultivation , or anywhere where absolutely pure water is required. Combined with a reverse osmosis system, it provides a final filtration stage that removes cations and anions from the water.

Easy handling

The DI cartridge is compatible with all standard 20-inch filter housings and can be replaced quickly and without tools when needed. A TDS or EC meter (not included) helps you determine when a replacement is necessary—namely, when water levels rise above 0 ppm.

Technical details

• Type: Deionization cartridge (mixed bed resin)
• Length: 20 inches
• Suitable for: GrowMax DI Kit 20" and other 20" filter housings
• Capacity: depends on the input water, typically several hundred liters
• Change interval: at EC > 0 ppm

With this 20" DI cartridge, you can produce ultra-pure water for professional applications – without any electricity consumption or chemical additives.

Shipping costs
For shipping within Germany, we charge a flat rate of €6.90 , and for seed orders, it's just €3.90 . We want to offer you a special shopping experience – for orders over €150, we cover the shipping costs for you, so your order will be delivered to your home free of charge.

Shipping time
We know how important fast and secure deliveries are. That's why your order will be carefully packaged and insured within Germany to ensure it arrives safely. Delivery time is typically 1-4 business days , so you can have your desired products in your hands soon.

You can return your order to us within 14 days.