Quote Originally Posted by mas985 View Post
I can help but I have to ask what is your objective and why do you need to know the head loss?


As for additional information:

Pump make/model

Filter make/model

Backwash valve size

Current filter pressure

Picture of the pad might be helpful too
Awesome thanks a lot. My current pump is all but dead (leaking etc.) and I am looking at replacing it with a Hayward Super Pump 3/4 hp (Model: SP2605X7A).

The issue is that the old pump is about 30 years old and pumps these days put out a lot more GPM for the same HP than they used to and I am concerned that the new pump may be too powerful for my setup. I was unable to find any specs for the current pump due to it's age for comparison purposes (I called Pentair, which purchased Pac-Fab, to see if they had any data on it, but their records did no go back that far).

I figure if I can get a reasonable estimation of what the Total Feet of Head is, I can look at the performance curve and see what the pump's resulting flow rate will be and whether that will be too much, or acceptable for my system. The last thing I want is to install a new pump, only to have something else break because it's too powerful.

I remeasured/calculated the pool size and it is closer to 8400 Gallons (not a whole lot different than before)

Setup:


Current Pump model:


Specs on motor of pump:


Sandfilter Specs (it is a 17-inch I believe, and old as well): (note I am in Canada If things are slightly different)


Current Filter pressure is around 13 psi after a backwash and 15 psi when its getting full.

Performance Curve for the new Hayward Super Pump: