Pressure Problem

[ballen]

Had a pool company here yesterday. They blew out all lines with a blower, inspected multi valve, still no idea. Get good flow on backwash or waste, very low in filter or recirc mode.

[PoolDoc]

Get good flow on backwash or waste, very low in filter or recirc mode.

=> restriction in the pool return lines, possibly at the eyeballs.

[ballen]

We blew out the return lines with a blower yesterday. If there was blockage in the returns, wouldn't I be experiencing high pressure at the filter instead of 2 PSI? Not sure how effective the blowout was, it was just a blower not high pressure CO2 or a compressor. Thanks for keeping up with this - the local pool guy is stumped as well.

[PoolDoc]

It's not practical to check for restrictions to hydraulic (liquid) flow using a gas. If want to test the lines, use a separate pool pump, flow meter and gauge.

But, have you checked the eyeballs in the returns??

[ballen]

Problem solved. The new pump I installed came without the diffuser. I took the one off my old pump, and away she goes. Thanks for all the help and I am sure I will be back for more.

[Watermom]

Thanks for coming back to tell us what the problem was. So many times, there are threads where people are scratching their heads trying to figure out what the problem is and then we never hear the conclusion to the story. When people do come back and report the resolution to their problem, it helps others in the future who may be reading this thread. So...... thanks!

[PoolDoc]

The new pump I installed came without the diffuser.

What do you mean? In the image below, #6 is the diffuser:


But self-priming centrifugal pool pumps cannot function properly without this part. I haven't tested it, but I'm pretty sure this pump (and most pool pumps) wouldn't pump at all, without the diffuser.