"No worries on asking difficult questions, I want to be as transparent as possible. Hopefully this will help explain our thought process and philosophy. For reference the tools that we use for measurements are Oakton PC 450 for TDS, Hach Titration kits (Total Hardness, Magnesium Hardness, Alkalinity, Sulfate & Chlorine), Thermo Scientific Orion 2 Star for pH, A&D HR120 Scale for weight and even a Versa Lab grinder for grinding down minerals
Much of the communication difficulty comes in the how most people discuss TDS & mg/L. Before people could add exactly what they wanted to the water they had to rely on less accurate measurements for understanding what is in the water (you could have more specificity but what was available to the average person were simple techniques). TDS meters for measuring calcium and sodium and titration for measuring Alkalinity, Chlorine, Hardness, Sulfates etc…., these were the tools of the trade and simple TDS meters did the vast majority of the measurements.
OUR THOUGHT PROCESS:
We use the less accurate but more widely used form of measuring TDS, the cheap and nearly ubiquitous TDS meter. This is b/c the vast majority of our customers will be able to communicate and understand the product and this is most likely the extent that they currently understand. For example: We aim for a total TDS of 150. If you put one packet in a gallon of distilled water and measure the TDS with a meter it will ready 150. If you were able to remove all of the magnesium sulfate from that packet and add it separately to a gallon of distilled it would read 95. If we talk about TDS in pure chemistry terms it will be too confusing to communicate properly.
We think the most important aspect of water chemistry and water profiles are duplicability. We strive to create a product that will easily give people a repeatable and duplicable water experience. By grinding the minerals the same way and mixing everything in a V-blender, we can have a high degree of certainty that each stick will be a statistical representation of the last.
I know this community is much different than the average consumer. Your degree of understanding is much greater, therefore our degree of specificity and transparency should be greater. So for ease of communication I will just give you the measurements of each mineral in the packet. The desired weight of each packet it 1.5 grams, this can vary from packet to packet and we are always trying to reduce our variability bit that is the target. If the weight of one packet is different the overall ratios will still be the same.
Magnesium Sulfate 1100mg
Calcium Citrate 300mg
Sodium Chloride 100mg
Magnesium Sulfate 1050mg
Calcium Citrate 300mg
Potassium Bicarbonate 150mg
We have found that the TDS of Magnesium Sulfate can not always be accurately measured (with out also factoring in a TDS meter) as the bound moisture can change over time, throwing off the weight. We are also working on vacuum drying some of the Magnesium Sulfate to create Anhydrous Magnesium Sulfate, this helps for storage and transportation to hotter areas. The anhydrous creates a natural desiccant inside the package and retards the decomposition from creating moisture in the package. This moisture can cause clumping in the Classic and can cause a chemical reaction in Espresso between the citrate and bicarbonate, puffing up the packets (they look like Barbie body pillows). If the anhydrous ever gets implemented I will need to update this above information for you all.
I hope this helps better explain everything and as always if you have more questions please let me know. Feel free to DM me your phone number and I can talk to you over the phone if you want, these long posts can become tiresome.