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-   -   Acid Rest (http://www.homebrewtalk.com/f36/acid-rest-65640/)

modenacart 05-12-2008 04:11 PM

Acid Rest
 
How much will an acid rest acidify the mash? My mash pH is around 6.1.

jdoiv 05-12-2008 06:00 PM

I'm not sure if their is a formula for determining this. The alkalinity of your water and the makeup of the grist are going to be important factors.

If you are going to attempt one, I would say check the pH every 10 minutes or so and see how much it changes.

moger777 05-13-2008 01:19 AM

acid rests add a lot of time to your brew, it's quicker to add lactic, phosphoric or calcium chloride to the mash to lower your pH. You can also add the buffer 5.2 stuff to take the guessing work out of your brew.

k1v1116 05-13-2008 01:40 AM

I wouldnt use an acid rest to correct the Ph only to help create ferulic acid that a hefe yeast can turn into a clove like phenol. add some gypsum, lactic acid, phosphoric acid, calcium chloride or Ph 5.2 buffer.

modenacart 05-17-2008 02:40 PM

The PH 5.2 buffer will get your ph in the right range without guess work? How does it do that?

jdoiv 05-19-2008 12:45 PM

Quote:

Originally Posted by modenacart (Post 681185)
The PH 5.2 buffer will get your ph in the right range without guess work? How does it do that?

It's a blend of phosphorous based acids and bases that will buffer the pH to around 5.2. If the pH is higher, the acids will lower it and if too low, the bases raise it.

It is a handy little product, but with a little work on your part, you can make salt additions to your water to achieve the same result.

modenacart 05-20-2008 12:35 AM

My water profile makes it tough to add salts.


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