Released: The Campden Tablet

[calumscott]

1 CT provides 50ppm (mg/l) sulphite in 1 UK gallon . . . would have to look up my article for amounts of K and Na (in the UK CT is predominantly sodium metabisulphite).

Water quality report generally have 2 entries for chlorine TOTAL Chlorine and FREE Chlorine. . . Free chlorine relates directly to chlorine gas and Total is gas plus chloramine.

The dosage rate comes from AJ deLangs work which used 3ppm as chloramine as the 'worst case' scenario for chlorination.

Thanks for that, I'll take time to digest and work it in somehow. I'm surprised at the UK tabs being Na not K - isn't there a suggestion that Sodium can leave an off flavour particularly in beer?

 

[Aleman]

1 CT provides 50ppm (mg/l) sulphite in 1 UK gallon . . . would have to look up my article for amounts of K and Na (in the UK CT is predominantly sodium metabisulphite).

Water quality report generally have 2 entries for chlorine TOTAL Chlorine and FREE Chlorine. . . Free chlorine relates directly to chlorine gas and Total is gas plus chloramine.

The dosage rate comes from AJ deLangs work which used 3ppm as chloramine as the 'worst case' scenario for chlorination.

Thanks for that, I'll take time to digest and work it in somehow. I'm surprised at the UK tabs being Na not K - isn't there a suggestion that Sodium can leave an off flavour particularly in beer?

At the specified dosage it increases the level of sodium by something like 1.2mg/l the point at which sodium becomes problematical is around 150mg/l . . . although London waters have over 200ppm sodium . . . so it becomes pretty meaningless in those terms.

 

[calumscott]

1 CT provides 50ppm (mg/l) sulphite in 1 UK gallon . . . would have to look up my article for amounts of K and Na (in the UK CT is predominantly sodium metabisulphite).

Water quality report generally have 2 entries for chlorine TOTAL Chlorine and FREE Chlorine. . . Free chlorine relates directly to chlorine gas and Total is gas plus chloramine.

The dosage rate comes from AJ deLangs work which used 3ppm as chloramine as the 'worst case' scenario for chlorination.

Thanks for that, I'll take time to digest and work it in somehow. I'm surprised at the UK tabs being Na not K - isn't there a suggestion that Sodium can leave an off flavour particularly in beer?

At the specified dosage it increases the level of sodium by something like 1.2mg/l the point at which sodium becomes problematical is around 150mg/l . . . although London waters have over 200ppm sodium . . . so it becomes pretty meaningless in those terms.

And there have been some really very good beers coming out of London for a very long time... Ho hum...

...all good stuff, thanks again!