I love the SPA, Hate the store and their financing I got it at but that is another story. I was sold Baqua Spa chemicals, seem easy to use. Lately I have been having a brown scum forming around the edge. I pulled the filters and clean them with the baqua filter cleaner but that dont seem to help. I have drained and refilled the tub and it persists. The tub is rarely used (I know why did i get it) that again is another story. This is our first ever hot tub, so there is alot I do not know. Please help with the scum and any other information you think I need to know or take into consideration. I have no clue when I was reading about ozonators if I need one or are they just nice to have, I live in a dusty hot climate, as the houses are built I hope the dust declines. We keep the tub covered at all times it is not being used and usually drain it once every month or two. I have read that some people have respitory ailments from the baqua spa chemicals, I have noticed we suffer from some of the same things, I go by the dosage directions on the chemicals but when you have the air bubbles on the mist seems to burn and choke (not enjoyable at all). I look forward to reading any all comments, ideas and suggestions which I am sure will generat more questions from me.