Ever since I installed the current pump, my usual steady state pressure on my filter had been 16.5 - 17 PSI (going up as the filter gets dirty- I flush it at 25% higher than starting). I replaced last years Nature2 Express cartridge with this year's and all of a sudden now I showing 21 PSi instead of 17. I even put in a new guage - still showing 21 PSI. All plumbing is 1.5 inch, and yes, I know my pump seems a little large - it replaced a 1.5 HP Superpump when it rotted out..
Any ideas where to start ?
I can replace the Superflo with a 30+ year old Hayward 3/4 HP Powerflo II that came with the house as a tub pump. I've used the Powerflo inbetween the Superpump going out and the Superflo going in, so I know it can handle the job.