I monitored psi at both 2400 and 3000. Psi went form 11 to 13-14 than stopped even for 6 hours.PSI monitoring should be done at high speed. You will not see a PSI change if you are running low speed. I check mine at 3000RPM.
Deep clean is rarely needed. Sand just takes longer. If it is improving, then you are likely ok.
What filter do you have? Have you added any pool store products we don't recommend?
Glad to hear. Would like to avoid deep clean. Have an 18 year old Tagelus TA-60. Sand was replaced about 4-6 years ago. Don’t know why.
At open I added some Alkalinity up on 2 occasions. Happy now they didn’t recommend anything else. Historically I start at open shocking pool after adding stanilizer. Then work on balancing..
Full renovation of pool last spring. This is first year we didn’t drain pool below returns. Left water at skimmers with gigits, etc. said to lower chance of floating liners. Periodic drain pool after rain with sump pump at least 4-5 times over winter and spring. Likely coincidence with algae.