Hi, we are retired senior citizens who enjoy our hot tub year round. For the longest time I had our hot tub problem free (so to speak) but lately I can't seem to get it correct. Either i am getting a lot of "scum" on the walls or we are getting itchy later at night from using it. I have gone to the spa stores here in town and am always given confusing corrections along with having to buy tons of chemicals. First use choline and dichlor and ph up ...ph down..then use bromine ..acid ..etc ..etc.. I am hopeing I can finally get some non-conflicting advice without it costing us a ton of money to not have good results... thanks for accepting us and helping us out