Determining Pump Flow Rate

[lborne]

I am having a pool built right now. It has an attached spa. When I fill the pool / spa, I can determine the exact gallons of the spa by measuring how long it takes to fill and knowing the gpm from my hose. Later, can I then drain the spa, fill it with the pump making sure it is sucking from the pool drain and returning only to the spa and be able to figure out the pump gpm? I know the head might be slightly off, but do you think it will be close enough?

 

[mas985]

That should give you a rough idea but it could be more than 10% off depending on the difference between the pool and spa plumbing. However, you could probably make adjustments based upon the difference in filter pressure.

 

[frankthailand]

blue-white-flowmeters-to-sell-to-tfp-members-a-few-left-over-t13793.html?hilit=flow%20meter
This thread might be of interest.
Happy swims
Frank