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I have been recently having some skin problems (Eczema) and hear that taking Bleach baths can actually help eczema, so on January 27th I drained our tub which has been a Bromine Tub. I flushed the tub (which I always do every water change)refilled, balanced and shocked our 550 gal tub with 1.2oz of Di-Chlor. I then let it run for 30 min and took a reading and was zero ppm. At this point I shocked again with another 1oz and after 30 min got a reading of 3ppm. Shocked again with 1oz more and brought up to 14ppm so at this point I let it sit for 16 hours checked and was back down to .5ppm or 96%CD. The next shock I gave it 1.8oz of dichlor which raised it to 14ppm checked 24 hours later and was back to .8ppm or 94%CD. At this point my CYA should be around 35ppm so I quit with the Dichlor. Yesterday I thought I would give it a good dose of MPS (3TBS) waited about 7 hours, then added 7.5oz of bleach (8.25%) and got a reading of 15ppm last night after running the bleach for 30 min. Today when I check it has been sitting for 14 hours so far and was at 7ppm or 47%CD. I will check again tonight at the 24 hour mark, but gonna guess it will be almost depleted again. We have not sat in the tub yet, trying to establish a Baseline first. Our tub is a Caldera Cantabria which does have an ozonator that runs 24/7 along with the recirc. pump. Not sure if I can unhook the ozonator or not or if this is what is causing my problems? I am looking for any advice at this point???? When we bought the tub new a year ago I made sure we flushed with awsome flush and shocked to 30ppm and left over night. We have always been very picky about our tub so would be surprised if its dirty, we have flushed every water change. I did also add 50ppm borates (boric acid) this time around yesterday morning gonna give it a try if I can get the tub up and going. Please let me know any advice you may have for me.

Big thanks to waterbear, nitro, and chemgeek from their immense wealth of knowledge and tips. Since I stopped listening to my idiot dealer and decomtaminated my new spa and switched to the nitro method, the maintenance is super easy, no hair is being pulled, and the water is crystal clear (even with the air on their is no white foam...just clear bubbles). In the nitro method instructions, the CD calculation is missing a parameter. You need to shock to 10PPM when you usually would use the tub and let is sit for 24hrs (hopefully after a drain and fill). Now write this number down, it is your chlorine decay. Then use the spa for the ususal time and measure FC afterward. This is your bather chlorine usage. ChemGeek is spot on in a showered, naked person uses 0.5PPM/15min. Now the 1st days equation is: Chlorine_decay - desired_preFC + bather_FC_spent, where desired_preFC is the amount you want to reduce the initial decay amount. The first day is where you set your desired Free Chlorine prebath amount. For example, let's say you shock to 10PPM, then 24hrs later it is 4PPM (chlorine_decay=6PPM) and your usage in 1hr is 2PPM. But you don't want to sit in 4PPM FC the next day but are ok with 3PPM, your desired_preFC = 4-3=1PPM. So when you are done, shock with 6-1+2 = 7PPM of shock. This leaves you with the 2PPM remaining in your spa after use + 7PPM = 9PPM FC. The next decay your decay of 6PPM will leave 3PPM for you spa session, when you get out it will be 1PPM. Now the 2nd equation gets used (and until you drain): Chlorine_decay + bather_FC_spent = 8PPM of shock. See you now have your 1PPM residual aftger bath + 8 = 9PPM FC. The above pre bath numbers are for example only. I prefer to sit in 4.5PPM and only use the spa for 45min. I consistently waste 1.5FC. My chlorine decay is 4.5PPM in 24hrs. So I always add 6PPM of shock.