Description
Semi-Automated CO₂ Dosing System with pH Monitor
Want the growth and color that CO₂ delivers—without jumping straight into full automation? This Semi-Automated CO₂ Dosing System pairs a professional CO₂ injection setup with an independent pH monitor + alarm, giving you a simple, reliable way to dial in CO₂ while keeping a constant eye on pH.
Instead of the system automatically controlling CO₂, you set your CO₂ output (bubble rate) manually, and the pH monitor continuously tracks your aquarium’s pH and alerts you if it moves outside your chosen range—so you can make adjustments before swings become a problem. If you want true hands-off control (automatic on/off based on pH), upgrade to our Fully Automated CO₂ System with pH & CO₂ Controller.
Product Overview
This Semi-Automated CO₂ Dosing System combines a reliable CO₂ injection setup with an independent pH monitor + alarm. You set and fine-tune your CO₂ output (bubble rate), while the monitor continuously tracks pH and alerts you if readings move outside your chosen range—so you can make quick, informed adjustments and keep your planted tank more stable. Tip: Most aquarists pair this style of system with a timer to shut off the regulator/solenoid during evening and night hours, then turn CO₂ back on when lights are on for a more predictable daily routine.
Ideal for aquarists who want:
- Manual control with guardrails (you adjust CO₂, but pH is always being watched)
- Clear pH visibility with alarms for peace of mind
- A step up from basic CO₂ kits without moving to full controller-based automation
- A practical planted-tank setup that supports healthy growth while staying fish-conscious
Helpful reads (Modern Aquarium CO₂ articles):
- 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
Everything below is included to build a reliable semi-automated setup (CO₂ delivery + pH monitoring) in one package:
- 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).
- A professional-grade regulator kit that includes a bubble counter, extra seals, and an electromechanically operated solenoid that can be used with a timer.
- Provides an easy-to-read, continuous pH display and alerts you when pH is outside your set range—helping you decide when to manually adjust CO₂ output.
- This 8-foot long Black Premium Silicone Airline Tubing is constructed to resist kinking, hardening and breakdown.
- 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
CO₂ equipment is only part of the planted-tank equation—healthy live aquarium plants, good lighting, and the right nutrients are what turn a setup into a thriving aquascape. We make it easy to build the full system with reliable service and clear delivery visibility.
- Trusted by Thousands: Modern Aquarium has been trusted by thousands of aquarists and has thousands of verified customer reviews 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 meant to work together—so you can confidently pair this system with live aquarium plants, substrate, fertilizers/root tabs, and planted aquarium lights for best results.
Bottom line: this kit gives you strong CO₂ performance with pH visibility and alerts—so you can fine-tune confidently while your plants (and livestock) stay on a more stable track.
