My filter has only gone to 25% twice. I check it regularly. Also question. I have made my pool robot go everyday, but I’ve only truly vacuumed once a week. Haven’t really had time. Is that making a difference?It is the filter. When your filter pressure rises 25% over clean pressure, clean the cartridges. Are you watching your pressures and cleaning?
Have you scrubbed inside ladders (removed from pool), behind lights, in the skimmers? Check the weir doors for algae?