Filter pressure not decreasing after backwash

[techman65]

I have noticed over the past month that my filter pressure does not decrease after backwashing. The gauge does go to zero when the pump is off, so I think the gauge is OK. It also does decrease slightly when I set the multiport to recirculate.

During the time I have been watching this, the gauge is almost always right around 20 PSI. My previous clean pressure used to be closer to the 12-15 range.

Some additional background:
I have had a leaky pump seal for a while. It was an older pump so rather than replace the seal, my home warranty company agreed to replace the entire pump with a new Hayward Super model. This happened yesterday.

Any recommendations of things to check regarding the gauge issue?

thanks.

 

[jblizzle]

Sounds like the new pump is moving more water than the old one and thus the pressure is higher. Does the return flow seem higher?

I would just assume that your new clean pressure is 20psi and backwash when it hits 24-25psi.

Would have been nice to upgrade to a 2-speed motor though and save some money on electricity ....

You could also Deep Clean your Sand Filter, but I am not sure that would be causing what you are seeing.

 

[techman65]

Well, the thing is, the new pump was just installed yesterday. I have been seeing the higher filter pressure for at least a month, and it remains the same with the new pump. I have tried backwashing for longer periods, but doesn't seem to make a difference.

And yes, it would have been nice to upgrade to a 2 speed motor. However, it was sweet to get a brand new Hayward pump installed for only $75.

 

[jblizzle]

So clean the sand and see what happens. Check for any return valves partially closed. Hopefully there is not a return clog somehow.