| Factor | Detail |
|---|---|
| Water hardness | ~15.3 grains/gal — JEA water is classified "very hard" |
| What it leaves | Mineral (calcium/magnesium) scale that etches if left |
| Best defense | Squeegee after each use + a protective coating |
This guide reflects typical First Coast projects. Prices and specifics vary with your space, glass and hardware — the most accurate number is always a free on-site measurement. Coastal salt air and Jacksonville's hard water are worth planning for; ask us about protective coating.
Last updated: June 2026
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