I have been in touch with Chemisphere UK who manufacture Chemsan and had a very prompt and helpful response. Today I received a replacement bottle of Chemsan & my original bottle was returned for testing. When I made up a batch of Chemsam with the new bottle and gave the mix what I thought was a good shake, I was a bit shocked to still only get a pH of 6. I then poured the Chemsan into a jug and mixed up some Starsan, sure enough I got a good reading of well below 3, more like 1 actually from the paper pH test strip. i then decided to re-test the original Chemsan in the jug and to my further surprise got a reading of about 1 very similar to the Starsan mix.
The moral of the story appears to be that Chemsan may require a really good mix to distribute the reagent through the whole 5 litre volume.
It would be really interesting if anyone else who is seeing this high pH problem could do a test but give the Chemsan a really good mix up before the pH test.
it may simply be that Chemsan is less readily dissolved than Starsan, if so that would be useful info for both us and the manufacturer.
The moral of the story appears to be that Chemsan may require a really good mix to distribute the reagent through the whole 5 litre volume.
It would be really interesting if anyone else who is seeing this high pH problem could do a test but give the Chemsan a really good mix up before the pH test.
it may simply be that Chemsan is less readily dissolved than Starsan, if so that would be useful info for both us and the manufacturer.