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Message: [QUOTE="crsublette, post: 160392, member: 3847"] Sorry WB, that is not correct. Sodium is not considered to be a salt in the context of pH chemistry. Sodium is considered to be an electrolyte element. "salt" in the context of pH chemistry is defined as an ionic compound that result from the neutralization of an acid or base. In our context, "salt" is the carbonate or bicarbonate. KH is the measure of the buffer system, not including calcium. In the context of our pond's water buffer system, the KH is a measurement of the carbonate (CO3-- or CO32- depending on how ya write it, and HCO3-). I was actually being redundant when I stated "pH is the result of the KH and its salt". To be more precise, pH is the result of a weak acid (carbonic acid, H2CO2) and its salt (CO32- or HCO3-). For anyone curious, carbonic acid (H2CO2) is the result of carbon dioxide (CO2) being dissolved into water (H2O). [/QUOTE]