Fully Automated CO2 System with PH & CO2 Controller

Fully Automated CO2 System with PH & CO2 Controller

If you want the benefits of CO₂ injection—faster growth, richer color, healthier plants—without constantly fiddling with bubble rates, this is the “set it and forget it” setup. Our Fully Automated CO₂ System pairs a professional dual-stage regulator with a true pH controller (not just a monitor) so your aquarium can maintain a steady pH target while automatically adjusting CO₂ injection for consistent, plant-friendly results.

The big advantage is stability: instead of leaving CO₂ running on a timer and hoping it stays in range, this system can turn CO₂ on and off as needed based on your pH setpoint—helping prevent the kinds of swings that can stress fish and other inhabitants.

Product Overview

This is our most advanced, convenience-focused CO₂ kit for planted tanks. The pH controller continuously measures aquarium pH and uses your chosen setpoint to control the regulator’s solenoid (CO₂ lowers pH). That means the system can automatically pause CO₂ when your target is reached and resume when needed—keeping your injection more consistent and your routine simpler.

Ideal for aquarists who want:

• Automation: CO₂ turns on/off based on your pH setpoint—no constant tweaking
• Stability: More consistent day-to-day pH behavior for fish-safe peace of mind
• Added safety: Dual-stage regulator design to help reduce end-of-tank dump risk

Setup Guide & Helpful Reads:

• Step-by-Step Setup Guide for Fully Automated CO₂ System with pH & CO₂ Controller
• Getting and Setting Up High-Tech CO2 System for Your Planted Aquarium: Comprehensive Step-by-step Guide for Beginners
• Modern Aquarium’s Guide to Setting up and Using CO2 in Planted Aquariums.

What's Included

This Fully Automated CO2 System with PH & CO2 Controller comes complete with the following components:

• 5 lb. CO2 Cylinder: This aluminum or steel CO2 cylinder has a 5 lb capacity. It is highly corrosion-resistant and this cylinder meets all regulatory standards and is relatively lightweight compared to other cylinders (Cylinder colors might vary between Silver and Chalk Gray).
• Dual Stage CO2 Regulator Kit with Solenoid Valve and Bubble Counter: Unlike the "Single Stage" regulator, this Dual Stage CO2 Regulator comes with a Dual Stage Valve for added safety and reliability. This added safety mechanism dramatically reduces the chance of accidentally changing CO2 output volume. This professional-grade aquatic Dual Stage CO2 controller kit also comes ready with a bubble counter, regulator seals, and an electromechanically operated on/off solenoid valve that can be used with a pH controller or timer.
• Milwaukee PRO ph & CO2 Controller: This pH controller measures your aquarium pH and also automatically controls it by turning your CO2 on and off when connected with your CO2 Regulator's Solenoid Valve (hint: CO2 lowers pH). Its job is two-fold: (1) keep pH at steady levels all the time and (2) control the amount of CO2 your plants receive, allowing for their optimal growth without dropping pH levels to dangerously low levels for your fish.
• Premium CO2 Tubing: This 8-foot long Black Premium Silicone Airline Tubing is constructed to resist kinking, hardening and breakdown.
• Glass Diffuser: A diffuser is a highly effective way to disperse CO2 throughout your planted aquatic system. The sleek, low profile of this diffuser helps to minimize visual distractions within the tank. A suction cup is included with each unit.

Shopping with Confidence at Modern Aquarium

Whether you’re ordering this automated CO₂ system, stocking up on live aquarium plants, or rounding out your build with lighting and substrate, we focus on a smooth, reliable buying experience from checkout to delivery.

• Trusted by Thousands: Modern Aquarium has been trusted by thousands of aquarists and has thousands of verified customer reviews on Google from real customers, so you can shop with confidence.
• Fast, Reliable Shipping: We process orders carefully and ship promptly with tracking so you know exactly when your equipment is on the way and when it’s arriving.
• Purpose-Built Planted Aquarium Gear: We stock CO₂ equipment and planted-tank essentials that are meant to work together—so you can confidently pair this system with live plants, fertilizers/root tabs, substrate, and planted lighting for best results.

The goal is simple: compatible products, careful handling, and clear tracking—so your planted aquarium gets what it needs without guesswork.