Before, we [installed the buoys, we] just weren’t protected. A guy might ride to the first pond at eight and might not get back to it until two hours later. If an aerator went out 10 minutes after he left, those fish would be dead.

The main reason to choose In-Situ instruments is because they’re easy to use. There’s no need to change the membrane or refill electrolyte solution, and calibration is done with a replaceable cap. Also, the reading is automatically stored and transferred

We’re getting about 12 months to two years without needing any calibration at all,” says Frerk. “The Aqua TROLL has performed brilliantly.

I particularly like that each sensor is designed as a quadrant and all the quadrants fit together to form a cylinder. It’s a good design because it facilitates antifouling and reduces the amount of exposed surface where fouling can occur.