Understanding the Pressure Gauge on your Pool Filter
From Swim University
Taking a look at a swimming pool equipment pad, with the pump and motor humming and the heater firing can be an interesting adventure. Trying to figure out where the water in certain pipes goes, and how to work the equipment is something that DIY'ers always want to know, just in case something goes wrong and they want to attempt a repair. One of the things that tends to baffle most people, however, is the little gauge on top of the swimming pool filter. This post from Matt Giovanisci of Swim University explains what the pressure gauge is, what it does, and what it is telling you.
Here is an excerpt from the post: