What you should take from the above is the word equivalents. What this means is what is being measured is not just CaCO3, but is expressed as if it were. So two water samples with different things in them may still give you the same KH reading. The problem is these two samples would not support the same fish.Alkalinity
Alkalinity is a measure of the acid-neutralizing capacity of water. It is an aggregate measure of the sum of all titratable bases in the sample. Alkalinity in most natural waters is due to the presence of carbonate (CO3=), bicarbonate (HCO3-), and hydroxyl (OH-) anions. However, borates, phosphates, silicates, and other bases also contribute to alkalinity if present. This property is important when determining the suitability of water for irrigation and/or mixing some pesticides and when interpreting and controlling wastewater treatment processes. Alkalinity is usually reported as equivalents of calcium carbonate (CaCO3).
Hardness is most commonly associated with the ability of water to precipitate soap. As hardness increases, more soap is needed to achieve the same level of cleaning due to the interactions of the hardness ions with the soap. Chemically, hardness is often defined as the sum of polyvalent cation concentrations dissolved in the water. The most common polyvalent cations in fresh water are calcium (Ca++) and magnesium (Mg++).
Hardness is usually divided into two categories: carbonate hardness and noncarbonate hardness. Carbonate hardness is usually due to the presence of bicarbonate [Ca(HCO3)2 and Mg(HCO3)2] and carbonate (CaCO3 and MgCO3) salts. Noncarbonate hardness is contributed by salts such as calcium chloride (CaCl2), magnesium sulfate (MgSO4), and magnesium chloride (MgCl2). Total hardness equals the sum of carbonate and noncarbonate hardness. In addition to Ca++ and Mg++, iron (Fe++), strontium (Sr++), and manganese (Mn++) may also contribute to hardness (APHA et al. 1998). However, the contribution of these ions is usually negligible.
Hardness is usually reported as equivalents of calcium carbonate (CaCO3) and is generally classified as soft, moderately hard, hard, and very hard. It is best to report results as the actual equivalents of CaCO3 because the inclusive classification limits for each category may differ between users of the information.
That’s why I asked, I don’t know how it’s possible but like most instances, those parameters aren’t that important which is why i asked, in case it some rare sensitive type fishDon’t know why that matters.
More interested in how a kh can be so high and pH so low at the same time.
it’snot really a problem as they are tank raised so I’d assume they don’t need those parameters
But this fish.