Cartridge Filter only last 16 months?

Is the water coming out of the returns at the same force it usually does? If so, maybe the gauge is bad.

I spoke to the PB this morning and he thinks that might be the issue. When I told him that the PSI doesn't change when taking the filters out (even though it still drops to 0 when the pump is turned off), he thinks the gauge is faulty.

Anyone have any recommendations for a replacement gauge? I found this one on amazon.
 
Thought it might be helpful to post an update.

Turns out the gauge was faulty. The new one from TFTkits was great, and after putting it in it read 19PSI. So, I just have an extra set of cartridge filters in the attic, guess I should've been a little more patient!

On the other hand, our heater still isn't working. I can hear it firing up but won't stay on (screen is blank too). PB thinks it might be a fuse, so we'll see.

Anyway thanks for the help on the cartridge filter problem and pressure gauge!
 
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