I'll make a side comment that a planned opening date of June 1 in central OH is too late to consistently open to a clear pool. I also am thinking that since you open late, you likely also close too early (before pool temp drops below 60 degrees). Above 60 degrees becomes prime algae breeding temps. You may have been successful before, but closing before 60 and opening after 60 is a recipe for pea soup. There are other factors too, but pool water temp at opening and closing is a key consideration.