Eheim CO2 SET400 – Reusable System with Night Shut-Off

Professional CO2 System for Healthy Aquatic Plants

The Eheim CO2 SET400 is a high-quality, reusable CO2 system designed to ensure strong plant growth, balanced water chemistry, and a healthier aquarium environment. Carbon dioxide (CO₂) is one of the most important nutrients for aquarium plants, supporting photosynthesis and oxygen production while helping to stabilise pH levels. With stronger plants, algae growth is naturally reduced, creating a cleaner and more balanced ecosystem for your fish.

This set includes all essential accessories – from a precision pressure reducer with manometers to a CO₂ diffuser with bubble counter and safety features – making it a complete solution for planted aquariums.

Equipped with an integrated 230V magnetic valve (night shut-off), the system automatically stops CO₂ supply during the night when plants no longer require it, saving gas and ensuring safe dosing.

Key Features & Benefits

Complete reusable CO₂ system – designed for planted aquariums
Night shut-off (230V magnetic valve) – automatically stops CO₂ at night
Precision pressure reducer – with manometers and fine dosing valve for exact regulation
360° rotating hose connection – flexible installation without kinking
High-quality CO₂ accessories included:
- CO₂-resistant safety hose (3m, Ø 4/6 mm)
- CO₂ safety diffuser with bubble counter & non-return valve
- 5 × water test strips for initial water value analysis
- Long-term CO₂ test with indicator reagent
Easy, safe installation – tool-free setup
Supports strong plant growth – improves oxygen levels and reduces algae
Made in Germany – premium quality with 3-year guarantee

Specifications – Eheim CO2 SET400

Model: Eheim CO2 SET400 (without bottle)
Power: 230V (magnetic valve for night shut-off)
Hose Length: 3 m (Ø 4/6 mm, CO₂ safe & pressure resistant)
Accessories Included: diffuser, bubble counter, non-return valve, test strips, long-term test kit
Use: Freshwater planted aquariums
Guarantee: 3 Years
Country of Manufacture: Germany

Why Choose the Eheim CO2 SET400?

If you want lush, vibrant aquarium plants and a stable ecosystem, the Eheim CO₂ Set400 offers professional-grade reliability with easy installation. Its built-in safety features, precision dosing, and night shut-off make it efficient, beginner-friendly, and long-lasting.

Perfect for aquascaping enthusiasts and serious planted tank keepers, this set delivers everything you need for effective CO₂ supplementation – just add your own CO₂ bottle.

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