I love having this device in my well water chlorination system
The flow indicator is plumbed inline on the output side of my Stenner feed pump and each pulse of chlorine makes the little ball inside rise, allowing visual verification that chlorine is moving through it. It also allows me to see any gas bubbles trapped in the pump's output line.
On the down side I had to replace my first one after only 3 years when it sprung a leak along one of the seams in the plastic. I paid $15 for the first one, but this one was $26, a compromise I made to get it quickly.
Original, New in Bag, OEM, Stenner AK600. works great and shows if you have an air leak on the suction side, like I did,,,,,,...SYSTEM IS NOW CHLORINATING AGAIN.........THANKS!