Water Pressure Differential Gauge

Factual Questions
1

I recently acquired and have installed a water pressure differential gauge (this one) on my well system in order to monitor the state of my filters and when to change them. The filters are 4" x 20" five micron and plumbed in parallel.

A simple schematic can be seen here.

My question is did I put the sampling ports in the wrong location - installed at “Sample Point 1a and 1b” or should I have installed them at “Sample Point 2a and 2b”?

When I was planning this, I assumed pressures would be the same on ALL input piping regardless of the locations of the sample point (and same for output piping). I realized that assumption may be wrong and I had better ask someone more knowlegable than I.

(It’s possible that this idea may not work at all because the filters are big, plumbed in parallel and the gauge has a range of 5 psi.
If so…oh, well.)

2

Either 1a or 2a is good for high side. 2b will give a better reading.

3

I would tap at 1a/1b if you’re going to put a gage on each filter, otherwise at 2a/2b to measure the system as a whole.

If everything is working normally, your assumption is reasonable, but if one filter clogs (or blows out) then I think you’ll see bigger differences between 1a/1b vs 2a/2b.

4

^ this. And I also have a well and two filters on it. This is an interesting system - the water pressure differential gage. Never seen one before.

My two filters are directly line, so a little different set up one right after the other. If I was keeping the house, I would definitely look into getting that gage.

5

Thanks. I always replace both filters at the same time as they should both get dirty at the same time.