Yeah, not sure why "1" stuck in my brain, my bad, but "5" is ideal, "7" (what it says on his water cooler bottle I'll wager) is NOT ok.
If it's OK for water, why not OK for beer? Is it pH/sugar/alcohol and leeching related?
If it's OK for water, why not OK for beer? Is it pH/sugar/alcohol and leeching related?