How Changing Pipe Size Affects Flow

From www.swimmingpoo... - See the difference in flow rates between 1.5" PVC return lines and 2" lines in swimming pool plumbing systems tested with a variable speed pool pump. The numbers may not be what you would expect to find in a seemingly small difference in pipe size.
#efficiency #swimmingpool #flowmeter

[@daved692]

Hey Steve, I just bought a 2hp variable speed pump, my pool is about 25000 gallons with 2 inch pipe, what would be a good schedule to program the pump and save money, my pool is 2 years old and had a single speed 1.5hp pump, thanks

[@jackkimani7549]

Does changing the size of pipe at the intake from small size to a bigger size affects the pressure.
Eg. Take water from a 36" pipe with an 8"pipe,then after a shot distance reduce the pipe to 5" then connect to an 8" pipe that serves an estate.
Question: will the pressure decrease or will it increase?

[@psychman22]

What is your thought on cya reducer. I tried it and it worked

[@Swimmingpoolsteve]

When I tried it I got intermittent and unpredictable results and ultimately stopped using it. Dilution is the solution! Glad to hear it worked for you, I have heard plenty of stories from both sides of the fence on this stuff.

[@grassthief1280]

Hi Mr, Sinclair can you tell me what brand CYA REDUCER YOU USED 👍

[@daverude417]

What do you think would happen with a 3" supply and 2" return

[@Swimmingpoolsteve]

Generally larger suction and smaller return pipes is a good idea. Not enough info here to tell ypu definitively what you should do, but 3" suction and multiple 2" returns would work.