metalresearcher
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NaOH in hotel swimming pool ?
During my holiday in a hotel in La Palma (Canary Islands) I watched what pool chemicals thy used: I found several jerrycans of a concentrated NaOH
solution and as pool desinfectant I found 'granular chlorine' UN 2468 which should be Trichloroisocyanuric acid which should be no acid at all as it contains no hydrogen.
Why so much NaOH ?
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rrkss
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chlorine stays in solution as the hypochlorite ion when the water is alkaline and gases off as chlorine gas when the water becomes more acidic.
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bbartlog
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TCCA hydrolyzes to hypochlorous acid and cyanuric acid. Leading to the situation rrkss describes.
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Ozone
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It also causes all of the Fe ions to precipitate as colloidal Fe(OH)2, which can be easily removed with the pool vacuum.
O3
-Anyone who never made a mistake never tried anything new.
--Albert Einstein
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BromicAcid
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People swimming and doing their business in the pool wreaks all kinds of havoc with the pH and organic content. Combined with the effects of the suns
rays and the atmosphere adjustments of the pH are usually done on a somewhat regular basis. Sodium hydrogen sulfate for acid and sodium carbonate or
bicarb for base. NaOH is occasionally used by some 'trained' individuals, usually the same people that insist on using elemental chlorine. It's
always interesting to do pool chemistry on a large pool and calculate out how much base you need only to find that 25 kg unit you just bought is
insufficient 
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