HYDROS 3/4″ Flow Sensor

HYDROS 3/4" Flow Sensor – Reliable Real-Time Flow Monitoring for Aquariums

The HYDROS 3/4" Flow Sensor makes flow monitoring straightforward, smart, and highly accurate for any reefing setup. Whether you're dialing in a reactor feed or checking return pump efficiency, this flow sensor for aquariums integrates seamlessly with your HYDROS automation ecosystem.

Keep Your Water Flow in Check with the HYDROS 3/4" Flow Sensor

Aquarium tech has evolved, and the HYDROS 3/4" Flow Sensor proves it. Instead of guessing if your return pump is working efficiently, this device gives you real-time flow data directly inside the HYDROS app. It helps hobbyists detect issues early—before they cause problems in the tank.

• Designed for ¾" plumbing with a range of 40–800 GPH

• Compatible with saltwater and freshwater systems

• Seamlessly connects via Sense Port on any HYDROS controller

• Built to automate connected gear if flow drops unexpectedly

HYDROS 3/4" Flow Sensor Features Better Automation and Protection

This aquarium flow sensor is more than just a data collector. When paired with a HYDROS controller, it actively improves your system's reliability. If the water flow changes, it can automatically shut down a return pump, switch off a heater, or activate a backup system. This is especially helpful when combined with Flood Control & Leak Sensors.

Additional HYDROS Flow Sensor Options

HYDROS also offers a full range of flow sensors for different plumbing sizes:

• ¾" Flow Sensor: 40–800 GPH

• 1" Flow Sensor: 50–1500 GPH

• 1.5" Flow Sensor: 100–2500 GPH

• 2" Flow Sensor: 200–4050 GPH

These sizes allow you to build a fully customized, fully automated system that fits your plumbing without compromise.

Warranty and Peace of Mind

Backed by a 6-month limited warranty, the HYDROS 3/4" Flow Sensor is built with durability and performance in mind. As long as it's used properly and not modified, HYDROS stands behind it.

Compatible HYDROS Controllers

• HYDROS Control X2 Starter Pack
• HYDROS Control X3 (Controller Only)
• HYDROS Control X3 / XP8 Pro Pack
• HYDROS Control X4 Starter Pack
• HYDROS Control X4 (Controller Only)
• HYDROS Control X4 / XP8 Pro Pack
• HYDROS Control X10
• HYDROS Control XD
• HYDROS Control XS Starter Pack
• HYDROS Control XS (Controller Only)

Similar HYDROS Accessories available

• iV w/ Ready-To-Use Alkalinity Testing Reagent
• iV Pro Isolated Testing Vessel
• Dual Inline TDS Sensor
• 1" Flow Sensor
• 1.5" Flow Sensor
• HYDROS ATO Kit
• Triple Optical ATO Kit
• Diaphragm Water Pump
• Water Level Sensor
• Triple Optical Water Level Sensor

HYDROS Cables available

• 1 Foot System Command Bus Cable
• 3 Foot System Command Bus Cable
• 6 Foot System Command Bus Cable
• 14 Foot System Command Bus Cable
• System Command Bus Terminator
• 9 Foot Drive Port Cable

HYDROS essentials and Reef inspiration

• • Discover wavemakers and return pumps to pair with the HYDROS flow sensor system 
  • Shop Inline filtration and skimmer-ready equipment for HYDROS automation
  • Explore daily tank tips and controller setups on Instagram reels
  • Product news, industry updates, and more on Facebook
  • Dive into expert advice and build threads on reef2reef forums