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That's amazing, I'll DM you!

Might be time for me to consider getting an RO system, so I don’t have to worry about the changing water. @SanPancho ill send you some of my water data from throughout the year on the BAM slack, see how it matches up with what you’re seeing.

Are there any resources I can look at to see how to titrate the water and test the alkalinity? (I assume this is what the brew lab kit does? But there might be other more precise methods?)

I'll email them. Are you saying basically that the average water is sticking pretty close to what I've measured? Yeah, I'm definitely suspecting the probe. But man, I just bought it in February. Isn't that quick for it to go bad?

Yeah, but I'm using direct lab tests from samples at my house, not EBMUD water reports. Certainly there are differences when they switch reservoirs, but I don't think big enough to cause this.

Four batches earlier in the year, using this probe, with the 3-point cal, were within expected error margin of Bru'n lab measurements. The problems have been only on the most recent three batches.

I've always done 3-point. I can switch to 2-point. Yeah, it's weird that the solutions that Thermoworks sells don't match what they have in their manual. So I manually enter the solution values. There's no temperature curve printed on the label, so I've been using the printed value. But I do...

Yeah, exactly. That's why I brought this problem to the smart people here! It's stumped my homebrew club too. Measurement error still seems like the most likely answer. I have an older Milwaukee meter still, so I'll check with both meters this weekend (and calibrate both too) Does acid storage...

I do a new BruLab kit whenever my TDS changes significantly. I'm in the SF Bay Area, so our drought means that water sources are changing a lot. But it's usually pretty soft. However, Batch 3 was brewed 6 days after I took the sample for Ward Labs, and the TDS measurement on the brew day...

6.08 is somewhat of an average. Here's the exact measurements: 10 minutes: 6.04 20 minutes: 6.06 30 minutes: 6.10 60 minutes: 6.35 The porter: 10 minutes: 5.82 20 minutes: 5.82 30 minutes: 5.82 40 minutes: 5.94 50 minutes: 5.92 60 minutes: 5.91 I typically see the pH increase slightly during...

Cool, so estimates are between 5.35 - 5.5, all very reasonable. And all way off from the measured >6pH. At least I didn't do something totally crazy with the additions....

When I say it worked for me before, I mean that it always lined up with my measured pH within a reasonable error bar. I also wonder if the malted Corn threw off the prediction. But that wouldn't explain the Porter recipe, which was all conventional grains.

EZWater with the same inputs estimated 5.51pH. Bru'n water estimated 5.35. Both very far off from my measured 6.08. (Note, both estimate 5.74 pH if I left out the acid)

Ok, when I cal this weekend, I'll just do a 2-point. I also have cal solutions from morebeer, so I can actually check with both just to be share. I'll gladly share everything I've got. I'll use the Cold IPA recipe, since that was most recent, used a ward labs report, and is what I'm re-brewing...

I haven’t checked them, since bru’n water has always worked great before. I can try those.

Yup. Doesn’t expire for a year.

The calibration solutions are/were brand new, purchased from Thermoworks along with the meter.

I’ve used Bru’n Water for several years now. It’s always worked pretty well for me, and my measured pH has always been pretty close to what the program estimates. However, my last few batches have ended up pretty far from the estimate, and I was wondering if any of you could help me figure out...

Thank you, that will work perfectly!

@SpikeBrewing What's the measurement from foot to foot for the 15 gallon vessel? I couldn't find this on the mechanical drawings on your site. I brew on top of a large digital scale, I use this to calculate volume throughout the brew day. I want to make sure this will fit on the scale without...