hi, i have a 195gal hot tub. I am having such a hard time balancing the water. we now are getting itchy skin. i have been to the spa store and all thy do is tell me to buy chemicals and do this and that but i can't get things going .. We had this hot tub for 6 years and just in the last year I have been struggeling. These are all the chemicals i am told to use. Can anyone suggest something easier for us? Thanks for your help .