How do I?

[Jimberbob]

Hello folks. I am brewing 'Robinwood Old Fart' today, a Wheeler recipe.
I have treated my water for the first time, having never experimented before.
I treated 35LTRS of water with:
1 crushed campden tablet
2 Heaped teaspoons Gypsum
1 teaspoon salt
0.5 teaspoon of Epsom salts.

I have just tested for mash PH, after 1 hour of mashing. I allowed the sample to cool first. I got a reading of 5.7.
Is this far enough out to worry about? If I should change it, how would I do so using the above additives?

p.s I'm mashing 6200g Pale malt
340g Crystal malt
340g Roast barley in 16LTRS of water.

[BigEd]

Without knowing the original makeup of your water it is difficult to answer but my first guess is that your water may be high in alkalinity/bicarbonates. This would tend to increase the mash pH. At pH 5.7 I wouldn't be too concerned with this batch but it might be a good idea to get a water report so you know where you stand.

[Jimberbob]

Thanks, it's the first time I have ever tested for PH. I am determined to increase the quality of my brews to that of top notch.
I have an expectent soon to be father in law who likes his ale, I don't want to give him any second rate brew, not that my brew is no good, I just want to get it to the best that I can.

[johnmac]

I just want to get it to the best that I can.

That's every brewers motto!