I have an in ground pool with Hayward sand filter, heater and chlorinator. Last monday I noticed that the pressure gauge was at 23 lbs, so I backwashed. Normally it would have dropped back to 14lbs, but it stayed at 23lbs and the pressure at the three returns was very low. Almost non-existent at the two by the stairs and a little more by the deep end. I switched the filter to recycle and the pressure stayed the same, so I did not feel it was a sand issue. Took the top off the chlorinator, turned on the pump and I had water spraying up about 7', so I believe the pressure is good that far. I was stumped at that point, so I had a local company come out (mistake). I was not here while they tested, but they say they tested the pressure going to the outlets and they did not see an issue. The switched out the sand, no change and now they are stumped as well. I would greatly appreciate any feedback you can offer.