When they installed my pool, the Hayward gauge always read 28 psi. They told me to backflush when I got down to 18. I never realized the gauge should be zero until being a part of this forum.
Now with the new gauge, it reads 15.5. Do I wait until it is at five before backflushing or is there a chance that it is already lower than it should be and needs to be back flushed ?