Thank you so much PoolDoc! I was SO worried! The ring in skimmer is kind of like mud - I clean it off and it reappears daily. Hopefully just organic debris. Pool is completely clear now, but can still smell the combined chlorine - can't see anything to vacume out - will brush again today and continue to maintain 15ppm. Ordering phosphate kit today - but, won't rain add phosphates?
Thank you PoolDoc and CarlD - don't know what I would've done without your help!!!