Pressure guage under pressure!

[CarlD]

OK, I have NO idea why he says 20lbs is bad. Sand filter?
Your pressure gauge isn't the problem. Either your filter is clogged or you have a restriction somewhere, or it's really too small for your pump. Have you changed pumps recently?
A sand filter may have gummed-up sand, or broken laterals. DE filters may have hard crusting on the screens. Cartridges may be clogged beyond what hosing-off will clean.

[rustypixel]

Sorry for leaving out the fact that yes, it is a sand filter. I have not had any change in pumps and, as stated in my original post, everything worked just fine the first two years. Are there tests that I can have done to the system to see if there is a blockage somewhere? By the way, when I backwash, I normally fill the pool to the point where I can backwash for a good 15 minutes before the water level returns to normal.

Thanks for any tips/suggestions.