Vincent,
If you empty the water, then you can use chlorine after bromine. If you don't, then once you put bromine or bromide into the water, then any chlorine that is added will simply convert bromide to bromine -- that is, you can't get it to be a chlorine spa because the chlorine just becomes a shock or reactivator of bromide to bromine. Once a bromine spa (or pool) then always a bromine spa (or pool) until you change the water.
Hydrogen Peroxide will dechlorinate the water so you could use it after chlorine without changing the water, but the initial hydrogen peroxide you add will get used up removing the chlorine -- after that, it will remain. However, hydrogen peroxide is not a fast-acting disinfectant at the levels that don't cause irritation in spa water. It is only an oxidizer and is typically used in Baqua/biguanide/PHMB spas.
I don't know why technically bromine won't work with N2 which is metal sticks of silver and copper, but perhaps the sticks are designed to release metal ions at a certain rate with chlorine and that they do not do this with bromine. There are other metal ion systems that are compatible with bromine such as Spa Frog.
I'll let others comment on how to avoid itch/rash, but would ask you to take a look at this link to determine if your rash is a chemical sensitivity or if it is bacterial in nature (i.e. hot tub itch).
Richard
Thanks richard for the link and your reply,
I read the link. not really suffering rash just itch now, could have called it a rash a month ago.
We spend aprox 1 hour in spa most evenings.
usually start to itch about 3 - 5 hours after exiting spar, and not every night. Have noticed dry skin on and about legs, back and arms. get over it by next day, sometimes made worst when area gets hot like laying on sheet in bed, the shoulder will start to itch and the nipples are sensitive to bromine now.
Maybe we have absorbed to much of either.
because the spa is relatively new to us as is the itch we are still getting in.
We do not shower after, we tried this and it didn`t help.
I did try the moisturiser and that helped the other itch...haha.
I live in small country town population 15000 so experteze is just not there.
thats why i`m googleing.
I do have another interesting question.
concerning the ozone thingy. sometimes it makes bubbles and sometimes it doesn`t, I know where it is cause i installed it and the flow from the pipe did not ever create bubbles until i fitted the ozone.
When I was running the bromine system it bubbled all the time when the pump was running but with the chlorine its eratic. Its seems to coinside with high chlorine readings or MPS application.
just another of a thousand questions..
cheers