Re: first post - aciam - converting pool from baquacil to chlorine
I still think the percarbonate is worth a shot. It is a strong oxidizer and it's worth the experiment. If it does not work you are out the price of the percarbonate, which is not that expensive. If it works you have added to our combined knowledge of pool chemistry if you are willing to do so. I have been researching online to see what I can find out about stablizaiton of peroxide by methylated hydantions and also any possible effects on biguanide (there is some indication that it may introduce additional polymerization but nothing specific that I can find so far.)
Methylated Hydantions are used to stabilize bromine and some chlorine disinfecting compounds so the sanitizer is release slowly but they have no effect on protection from UV so they are not commonly used in chlorine products for pool. If I am not mistaken the chlorinated hydantoins will test as combined chlorine but will still slowly release hypochlorous acid. (Ben, Chem Geek any info on this? What I have been able to find is really spotty and I have had to read between the lines a bit, so to speak.)
The old adage that 'bromine is forever' is true when the bromine source is from either BDCMH or DBDMH (the two most commmon bromine tabs used in pools and spas) because the DMH keeps the bromide from oxidizing to bromate and therefore to convert to chlorine you must drain and refill. When inorganic bromine is used (sodium bromide) the continual addition of chlorine and the effect of sunlight will effectively destroy the bromide ions so the cannot regenerate bromine sanitizer and the pool or spa converts back to a chlorine system again as long as more sodium bromide is not added.
If I find out anything else I will post it!
Retired pool store and commercial pool maintenance guy.
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