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CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 18, 2015 21:22
by NickW
Further to alemans talk on water last week. I decided to check my CRS. I blindly trusted it before and never actually checked the alkalinity after adding it.

Calculator suggested 10.9ml of CRS to get my desired alkalinity. So I added 8ml to be cautious. Stirred up the strike water good and retested.

It was only a few points off expected alkalinity! So a rough calculation suggests that 8.5ml would have been sufficient.

It's by no means a scientific experiment but it suggests the CRS I have (brupaks) is 25% (ish) stronger than expected. Which is pretty much what aleman said himself.

Re: CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 18, 2015 22:00
by Dennis King
I've recently moved over to using sulphuric acid instead, from Murphy's. After doing my own test that turned out higher than stated.

Re: CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 18, 2015 22:01
by NickW
You wouldn't have thought it'd be hard for them to get the strength right would you?

Re: CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 18, 2015 22:38
by GrahamT
I'm going to check the effect of my AMS this weekend's brew after treatment, for the first time. I have been trusting the maths until now. I tested a litre's treatment last week and it proved overly strong on the face of it, though in such small quantity my measuring could easily have been off. Will be interesting to see though.

Once I have tested the effect, I guess it's fine to adjust accordingly and retest with each new bottle.

Re: CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 18, 2015 22:46
by Dennis King
The fact there are discrepancy's shows how important it is to check your alkalinity after treatment as well as before.

Re: CRS appears to be 25% stronger than expected

PostPosted: Thu Jun 25, 2015 13:50
by BeerBloke
Not sure where Clive gets his AMS/CRS from but I found the equivalent stuff from Niche Solutions to be much stronger, perhaps that's what's happened?

Re: CRS appears to be 25% stronger than expected

PostPosted: Fri Jun 26, 2015 01:13
by Good Ed
That's why it is always good practice to test and only add 3/4 of CRS or acid, then test again before final addition.