Sand PSI Pressure

Possibly, but two other things come to mind when evaluating a system's pressure:
1 - Could the gauge be malfunctioning? Does it fall to zero when the system is off?
2 - Is that 18 psi right after the filter was cleaned/backwashed?

One other thing to consider ... when was the last time the sand was deep cleaned? Deep Cleaning a Sand Filter If you've not done it in a while it's possible that the sand is compacted and effecting your flow rate.

Hope this helps.
 
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