Happy HolidaySs Giveaway - Winners Re-Re-Re-Re-Drawn - 24 hours to Claim!

Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > Brew Science > water report questions about calcium
Reply
 
LinkBack Thread Tools
Old 06-24-2011, 05:01 AM   #1
soundguy
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2010
Location: Seattle
Posts: 3
Default water report questions about calcium

My water report says 23 is my calcium level. It also says the unit is "mg/L (as CaCo3)"

Palmer says that to get calcium ppm from from calcium hardness as CaCo3 I need to Divide by 50 and multiply by 20 giving me 9.2

My question is what number do I use for brewing? 23 or 9.2

__________________
soundguy is offline
 
Reply With Quote Quick reply to this message
Old 06-24-2011, 05:24 AM   #2
Suthrncomfrt1884
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2009
Location: Rockford, Illinois
Posts: 4,079
Liked 25 Times on 23 Posts
Likes Given: 3

Default

There are 1 million milligrams in a liter. So...when you see mg/L, it means ppm. Use 23.

__________________
He who drinks beer sleeps well. He who sleeps well cannot sin. He who does not sin goes to heaven.

Another HERMS rig...
Suthrncomfrt1884 is offline
 
Reply With Quote Quick reply to this message
Old 06-24-2011, 12:34 PM   #3
ajdelange
Senior Member
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: McLean/Ogden, Virginia/Quebec
Posts: 6,350
Liked 656 Times on 544 Posts
Likes Given: 19

Default

Both numbers mean the same thing so the one you use depends on what you are trying to do. If you are trying to calculate RA, for example, the formula is

RA = alkalinity - [calcium_hardness + magnesium_hardness/2]/3.5.

If you want RA in ppm as CaCO3 (the more usual way of expressing it) then calcium_hardness (and the other terms) should all be in ppm as CaCO3 as well. If you only had the as Calcium number you would have to convert that to as CaCO3 (by dividing by 20 and multiplying by 50).

The popular spreadsheets want mg/L as the ion (i.e. not ppm as CaCO3). Fancier ones let you enter in any units (mg/L as the element, ppm as CaCO3 or mEq/L) and use radio buttons for you to specify which.

Some water authorities report calcium and magnesium in terms of hardness (ppm as CaCO3) and some as the ion (mg/L Calcium) and some give the numbers in both sets of units. Ward Labs, the source from which most homebrewers derive their water information, reports these as the ion but reports alkalinity as CaCO3. You need to understand what units your data are in and what units you application requires and know how to convert.

Finally, as it is the subject of another thread here, there are approximately a million mg of water in a liter (depending on temperature and concentration of dissolved items) so that 1 ppm is approximately 1 mg/L

__________________
ajdelange is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
North Penn Water Authority (Montgomery Co., PA) Water Report lebshiff21 Brew Science 11 04-30-2014 11:13 PM
Water report questions flipper51 Brew Science 12 01-26-2011 10:30 PM
Ward Water Report - Few Questions ihearthops Brew Science 13 07-08-2010 05:05 AM
Water Questions: (Maxes for) Residual Alkalinity, Bicarbonate, Calcium Hop Brew Science 4 03-02-2010 02:38 PM
Water: German Degrees of Hardness and Calcium MattHollingsworth Brew Science 4 05-22-2009 05:28 PM



Newest Threads

LATEST SPONSOR DEALS