Sizing a new pump

[lstinthot]

I installed the WFDS-26 today. Went pretty good. Took a little longer than expected to complete. The discharge pressure on high is 16# and maybe 2# on slow speed. Not sure what others are seeing for slow speed discharge pressure. I did change the piping on the return of the filter. It now comes out of the filter and goes back to the pool without going through the heater or clear water metal copper system. Very little water comes out of the vent when I open the vent on top of the filter in slow speed. I am returning to the bottom drain of the pool. We keep this lineup during the spring to help heat the pool. Have not tried going back to the return jets.
Pump is significantly quieter then the ultraflow 2HP even on high speed.

New filter elements will be in Friday.

[mas985]

Low speed will have lower pressure and theoretically should be about 3 PSI but gauges get inaccurate at low PSI. 1/2 the flow rate results 1/4 the head loss in the plumbing.

But is the pump basket staying full between pump runs?

[lstinthot]

The pump started up immediately the following day. Pump was full pressure came right up to 16# . Best it has ever done. I'm thinking slow speed could have started moving water from the start.

[mas985]

As long as the the pump doesn't lose prime after being off, you can start it on low speed if you want.

[lstinthot]

I plan on starting the pump in slow speed tomorrow to see how it does. We will add timer dogs once we are happy with the pump starting with no issues.