What 17.1 GPG Means for Your Home
Turn on any faucet in an untreated San Antonio home and within weeks you'll see white crust forming around the aerator. That's calcium carbonate — the same mineral building up inside your water heater right now, reducing its efficiency by up to 19% and cutting its lifespan by more than half.
At 17.1 GPG, San Antonio sits firmly in "Very Hard" territory — 134%% harder than the US average. The Battelle Memorial Institute tested this rigorously in a study commissioned by the Water Quality Research Foundation: water heaters running on untreated hard water above 12 GPG failed in under 2 years. The same heaters on softened water lasted the full 10-year test period. That's not a sales pitch from a softener company — it's an independent lab study.
The effects show up everywhere. Showerheads lose pressure as mineral deposits clog the jets. Dishwashers leave white film on glasses. Washing machines need 50–75% more detergent to get clothes clean, and fabrics wear out faster from mineral abrasion. The geological source is Edwards Aquifer (limestone) — mineral-rich water that picks up calcium and magnesium before reaching San Antonio's treatment plants.
Salt-free conditioners won't cut it at this level. At 17.1 GPG, you need ion exchange — a real softener that pulls calcium and magnesium out of the water. Most San Antonio plumbers don't debate whether you need treatment at this hardness — the question is which system.
What a San Antonio Plumber Would Recommend
Recommended: Fleck 5600SXT Whole-House Softener
At 17.1 GPG, you need serious capacity. The Fleck 5600SXT with 48,000-grain tank handles very hard water for a family of 4. Metered regeneration means it only cycles when needed — saving salt and water. This is what most local plumbers install.
$650–$900 + installation
Check Current Price →For Drinking Water: APEC ROES-50 Reverse Osmosis
The softener handles hardness; the RO handles everything else. Removes trihalomethanes, chromium-6, and virtually all other contaminants from your drinking water. Install under the kitchen sink.
$180–$220
Check Current Price →The combined setup (whole-house softener + under-sink RO) runs $1,000–$1,400 total. At $1492/year in hard water costs, the system pays for itself in under 11 months — then saves you $124/month indefinitely.
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