forrestranger

Hi Everyone; i recently bought a new Bullfrog spa (very happy with it), but... i can't seem to get the chemicals right or something. i bought a water test kit (the kind you put drops in) and i "think" i have gotten it down.. just to be safe, i go to a pool center and have them test it and tell me exactly what i need. my wife is SUPER sensitive to bacteria and got a rash... so i emptied the water out, cleaned the whole system, then wiped the spa out with white vinegar. i filled up the spa with new water, went and had the water tested at Leslie's Pool Center, and they told me exactly how much of what to put in... i did... that night i was the only person to get in... i showered first to make sure i didn't have any sweat or oils on me etc.. i got in it that night for about 45 mins, and the next day i was shocked to see like scum marks around the edge of the water line (not every where, but in some places, too many places)... i had totally cleaned both filters the day before also...i don't get it, how does this happen? i'm just about OCD clean about my spa and being clean getting in, but it doesn't seem to matter. any help would be appreciated...