Need help with water profile

[Iowa Home Brewer]

Hi all,
I'm moving into all grain and one thing that is really concerning me is water profiles and salt additions.
I am going to start with a grain bill for a sweet stout.
1 lb choc malt
7 lb Pale 2 row
1 lb carm/crystal 40L
8 oz wheat
8 oz roasted barley
4 oz maltodextrine
1 lb lactose
1 oz cluster
1 oz golding
8 oz choclate slurry
4 oz choc tinkture
Attached is my water here in Cedar rapids.
First , I think my Magnesium is really high. But have been told not to worry so much about it and that it won't be a noticeable taste by a reputable brewmaster.
When using Brewfather I choose dublin/dark ale as my target profile.
In order to get a balanced profile it says 4g calc Chloride, 4g gypsum, 1 g baking soda which gives me a 5.25 ph.

This how I input my cedar rapids profile of which I am not certain is correct
See attached.

Am I on the right track here?
Any help would be appreciated.
I hope this is posted in the proper area if not my apologies.

 

[VikeMan]

A couple of observations:

- Your Chloride is 25 ppm (not 3). It's the chloride ion we're interested in, not chlorine (which you'd want to remove with campden or some other method anyway).

- Magnesium at 60 ppm is pretty high, and likely to cause a bit of sour flavor. If I were going to use this water, I would be cutting it with RO water or distilled water, and then building back other ions (if needed) by salt additions.

 

[Yooper]

I agree. A magnesium level of over about 28/30 ppm can bring a weird sour-ish flavor to the beer. I’d use 50% RO water for that reason, and increase the chloride to 50/60 ppm. I’d also shoot for a mash pH of 5.5 or so, which may require a little baking soda depending on how much the RO water decreases your alkalinity. Calcium chloride will also increase your calcium, which is a good thing.

You will definitely want to use a campden tablet to get rid of the chlorine.

 

[Iowa Home Brewer]

Thanks .
I kind of thought I was looking for Chloride rather than chlorine. But me doubting myself, I did the opposite.
I will correct that. I'll also dilute.
I really appreciate the input.