Originally Posted by Kaiser
the pH of tap water should not be that high. I think 9.5 is the highest that the EPA allows.
And yes, the drop kits have an inherent error which is particularly noticeable when you need only a few drops. You could increase the precision by taking twice the sample volume and dividing the drop count by two. But that doesn't get rid of the systematic error caused by drop sizes that are not the same size as intended by the manufacturer.
I never did get an answer from the city but I did finally track this down. It is from 2011 and is just labeled "typical". Since it is reservoir water I know it changes.
This is ugly going from postscript to spreadsheet to web page but I'm not going to obsess to much.
The following analysis is typical of the treated water from our plant
Turbidity 0.11 NTU
Alkalinity-Total 43 mg/I as CaCO3
Alkalinity-Phenolphthalein 31 mg/l as CaCO3
Alkalinity-Hydroxide 19 mg/l as CaCO3
Alkalinity-Carbonate 24 mg/l as CaCO3
Alkalinity-Calcium Carbonate Stability 11
Hardness-Total 94 mg/l as CaCO3
Hardness-Non carbonate 51 mg/l as CaCO3
Chlorine Residual-Total 1.8 mg/I
Chlorine Residual-Free 0 mg/I
SOlids-Total 254 mg/I
Conductivity 521 umhos/cm
Threshold Odor Number 1
Just put this here to answer the high pH question. Yeah, it is real. These numbers (not all shown here) put into your new online calculator got me to about .03 pH reading though. But, that is another story for the other thread.