I just installed a flow-meter to gauge the flow rate in gallons per minute (GPM) of my pump/filter system. I purchased a Blue-White flow-meter, model # F302 PR for a horizontal run of pipe (2"). I purchased it from HERE. I needed to install it on a 28" straight run of pipe to have accurate readings.
Here's the run of pipe that it will be installed on.
Here's what comes in the box.
Here it is installed with about 28 GPM flow running through it.
My pump is an Intelliflow 4x160 that I've been running at about 1600 RPM which turns out to be 28 GPM. In that case, I get one turnover every 6.5 hours for my 11,000 gal. pool.
My intent is to tinker with different RPM settings and report the corresponding flow rates so other board members here can use it as a rough guide for their system.
Installing this meter was one of the easiest things I can think of to do. It took me all of about five minutes to turn off the pump, bleed off any pressure, measure the pipe for placement of the meter, drill the hole with a 5/8 inch spade bit, clean off the burrs, place the meter in the hole, and tighten down the clamps. That's all there is to it. The hardest thing was letting go of about $80 to do it, but I think I may be able to save at least that in electricity costs by setting the pump to achieve about one turnover a day.