--- title: "Blog | powerful form of chlorine sanitizer OCI: Weaker ch" description: "powerful form of chlorine sanitizer OCI: Weaker ch | pool, above ground pool, inground pools, hot tubs, owen sound, port elgin, spas, grey bruce, drinking water owen sound, pool chemicals port elgin, ontario" --- # Our Blog ## [WHY BROMINE IN SPAS? BETTER AT HIGHER PH RANGES!](https://www.rintouls.ca/blog/bid/359413/WHY-BROMINE-IN-SPAS-BETTER-AT-HIGHER-PH-RANGES) Posted by [Yvonne Schnurr](https://www.rintouls.ca/blog/author/yvonne-schnurr) on Wed, Dec 11, 2013 @ 10:20 AM - [Tweet](https://twitter.com/share) ![describe the image](https://www.rintouls.ca/hs-fs/file-222366838-jpg/images/pictures_2007_to_jan_2008_010-resized-600.jpg) THERE ARE MULITPLE REASONS for bromine's dominance as a hot tub sanitizer, but the most important is the fact that bromine is more active at higher pH range than chlorine. Chlorine exists in two different forms - free chlorine (HOCI, hypochlorous acid, the good and powerful sanitizer) and hypochlorite (OCI -, the much less effective ion). At a pH of 7.5 there's about 50 percent of each. That 50/50 situation occurs higher up the pH scale (where hot tubs tend to opperate) for bromine. As a direct comparision, at a pH of 7.5, bromine (HOBr), active to inactive. In a hot tub enviroment, with higher temperatures and agitation from jets, pH tends to rise into the 7.8 -8.2 range. At that level, bromine produces much more active sanitizer than chlorine, which loses its effectiveness at higher pH. See the chart below: | **Chlorine & bromine sanitizers** **Vs. pH** | **HOCI: Most active, powerful form of chlorine sanitizer** | **OCI: Weaker chlorine sanitizer** | **HOBr: Most active, powerful form of bromine sanitizer** | **OBr: Weaker bromine sanitizer** | | --- | --- | --- | --- | --- | | 7.0 | 76% | 24% | 98% | 2% | | 7.2 | 66% | 34% | 96% | 4% | | 7.5 | 50% | 50% | 94% | 6% | | 7.8 | 33% | 67% | 87% | 13% | | 8.0 | 24% | 76% | 83% | 17% |   0 Comments [Click here to read/write comments](https://www.rintouls.ca/blog/bid/359413/WHY-BROMINE-IN-SPAS-BETTER-AT-HIGHER-PH-RANGES#comments-listing) Tags: [How to get the best value](https://www.rintouls.ca/blog/topic/how-to-get-the-best-value), [Hot Tubs](https://www.rintouls.ca/blog/topic/hot-tubs), [Chlorine & bromine sanitizers](https://www.rintouls.ca/blog/topic/chlorine-bromine-sanitizers), [HOCI: Most active](https://www.rintouls.ca/blog/topic/hoci-most-active), [powerful form of chlorine sanitizer OCI: Weaker ch](https://www.rintouls.ca/blog/topic/powerful-form-of-chlorine-sanitizer-oci-weaker-ch), [HOBr: Most active](https://www.rintouls.ca/blog/topic/hobr-most-active), [powerful form of bromine sanitizer OBr: Weaker bro](https://www.rintouls.ca/blog/topic/powerful-form-of-bromine-sanitizer-obr-weaker-bro) [All Posts](https://www.rintouls.ca/blog/all) ### Subscribe via Email ### Follow Me ### Latest Posts ### Posts by Category - 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