If going for 20 residual from a starting of 38....guypettigrew wrote: ↑Wed Jan 29, 2020 7:47 pmOh dear, I seem to have got this wrong-no idea how! Checking GW's calculator again you'll need to add 0.1ml/litre of AMS to your raw water to get to an alkalinity of 20ppm. Exactly as wallyBrew says. Where the 0.07 I posted earlier came from is a mystery. And a huge embarrassment.guypettigrew wrote: ↑Wed Jan 29, 2020 9:59 amHi BB
To get your water to the right sort of figure of 15-20ppm alkalinity you'll need to add 0.07ml AMS to every litre of raw water you're planning to use.
Guy
Hang on, just worked it out!!! The 0.1ml/litre changes to 0.07ml/litre when you select 'dry pale ale' as the target liquor, having entered your raw water composition.
Now I'm confused!
So, can anyone explain what's going on? And which is the correct figure for the AMS addition?
Guy
(38 - 20) x 21 / 186 = 2.0(3225....) bloody calculators as Eric would say
This assumes CRS/AMS still neutralises 186mg ocalcium carbonate per mL
and yes it does look like it has an issue with the calculation
so go with the manual version
(total alkalinity - required alkalinity) x volume to be treated / 186 ---------- which gives mL to add