Pool is new, just finished in December. During rhe pool builder's pool school, they said to clean out the filter monthly, replace yearly. I cleaned it out in February and noticed after the pressure was running lower than it was previously and lower than the green arrow on the gauge. Last week, I cleaned it again ahead of schedule because I've been having an issue with thrips. After, I noticed the pressure was running higher than before, but it was right with the green arrow.
The pump turns on automatically at 100% at 9 am, then runs at 85% once it gets hot enough for the solar panels to kick on. This morning, I returned home from taking my daughter to school and as soon as I got to my driveway, I heard a high pitched whining coming from the pump/filter. It went away when I manually decreased the pump speed down. After finding some anecdotal evidence that it may be the filter making the sound, I cleaned it again this afternoon. I also opened the drain plug and hosed out the inside. After starting everything back up, there was no more whining sound at 100% speed, but the filter pressure has gone up even higher than before and is now running above the green arrow at 100%. I thought the pressure should be lower after cleaning, so I don't know what is causing this. I do have a brand new cartridge I can put in there, but I was hoping to wait until after I get the thrips situation handled (open to suggestions for that as well!).
Apologies for the long post. I'm new to all this and trying to be thorough!