Swg low flow….rpms needed keep getting higher

[trivetman]

I installed my swg (hayward) and vsp (pentair whisperflow) last season. 1300 rpms kept the flow switch happy until I closed it up (3 months of runtime)

This season, when I opened in April, 1300 was getting low flow so I bumped it up to 1500.

Today, low flow again. I bumped it to 2000 for the moment and the switch is happy again.

Thoughts? Is this common?

Setup is a vertical cell with fflow switch on the horizontal run preceding the vertical turn. Has well over 12” straight run before the flow switch.

 

[Jimrahbe]

T,

The number one reason for the flow switch to not work is a dirty filter...

Thanks,

Jim R.

 

[trivetman]

Hmmm…maybe. I usually just leave the filter all summer and fully clean it when closing for winter. The pressure never rises over that time. Its worth giving it a backwash and see if that does it.