I was under the same impression. However one of the players with the noticeable bulge is a physicist doctorate student who has done work in fluid mechanics. He explained that the flow of chemicals in such situation creates the effect of the outer speedo being exposed to the "current" flow of chlorine. This in hydrdynamics exposes the outer speedo to more chlorine comparably to the inner speedo. The inner speedo is able to hold up better and last longer.
I know this might sound a bit counterintuitive. But it does seem to make some sense.
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