Where hardness minerals come from, why readings vary between neighborhoods, and what the buildup on your fixtures is telling you.
Hardness is a measure of dissolved calcium and magnesium. In much of Florida those minerals enter groundwater as it moves through limestone formations, which is why hardness is a routine finding rather than an unusual one.
Readings are not uniform. Two homes a few miles apart can measure differently depending on the source, the utility blending it, and whether the property draws from a private well instead.
The visible signs are consistent even when the numbers are not: chalky residue on aerators, spotting on glassware, and soap that refuses to lather. Inside the plumbing, the same minerals deposit as scale on heating surfaces.
The practical takeaway is that hardness is measurable. A reading in grains per gallon turns a guess about your water into a number you can make a decision from.
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