Bicarbonate question for pilsner water profile.

[camonick]

I have a pilsner recipe on deck for a future brew day. I have plugged my water info into Bru'n water and have a question about my Mashing Water Profile estimates. I am diluting my well water with RO water and adding 0.15 gm/gal. CaCl2 and 0.53 mL/gal 88% lactic acid to get these results: (ppm)
Adjusted: ~ Desired:
Ca: 29 ~ 20
Mg: 3 ~ 0
Na: 11 ~ 8
Sulfate: 8 ~ 15
Cl: 32 ~ 35
Bicarbonate: -35 ~ 0
Estimated mash pH: 5.34

Is the negative Bicarbonate value anything to be concerned about with all other values being close to the desired level?
I am doing full volume BIAB no sparge.
The recipe is:
9 lbs Pilsner malt
4 oz. Dextrine malt
4 oz. Crystal 10
2 oz. Sazz (2.8% AA) 60 min
1.5 oz. Sazz (2.8% AA) 15 min
.5 oz. Sazz (2.8% AA) 1 min

Thanks
Nick

 

[Yooper]

No- you only need enough bicarbonate to give you the proper mash pH. You seem fine.

 

[ajdelange]

Negative bicarbonate is Martin's way of representing the effect of lactic acid. It has nothing to do with bicarbonate ion. It would be of concern to someone trying to decide whether to use this program as opposed to another one but other than the fact that it has confused you, as it has many others, there is no reason to worry about it.