Originally Posted by afr0byte
If you have a kH kit then you can directly measure the alkalinity. But, I believe he's said they'll usually remove about 95% of everything (some a little higher, some a little lower). Even if it's only 90% for yours, you should still be within the primer's alkalinity max, I'd imagine.
I did- but I just had a "duh!" moment. I'm embarrassed to admit this, but I added 3 grams CaS04 and 4.5 grams of CaCl2 to my 13 gallons of brewing water and sort of forgot about it (as the water was "done").
I mashed in (mash pH 5.55), added two gallons of tap water to my water in the HLT (HLT is small and needed a bit more) and checked the alkalinity with the GH/KH kit. It's HIGH. I went into a mini-panic, thinking my brand new RO system was junk.
Then, the light bulb went off. Um, next time, dummy, do that before you add the salts!