Why Texas municipal water destroys tankless heaters, plumbing fixtures, and glass shower doors. Grain capacity sizing, dual-tank ion exchange, and reverse osmosis drinking water.
Calcium and magnesium minerals in Texas limestone aquifers build scale inside pipes, ruin luxury plumbing finishes, and cause premature appliance element burnout.
Formula: (Number of Residents) × (75 Gallons/Day) × (Grains of Hardness) × 7 Days between regenerations. A family of four in 18 GPG water needs a 38,000 to 48,000 grain capacity softener.
Texas has some of the hardest water in the nation. Central Texas (Austin, San Antonio) averages 15 to 25+ grains per gallon (GPG), classified as extremely hard. Houston and DFW average 8 to 15 GPG.
A professional ion-exchange water softener installed with loop bypass piping typically costs $1,800 to $3,400. Adding an under-sink reverse osmosis system adds $600 to $1,200.
No, untreated hard water voids tankless warranties. Most manufacturers require water hardness below 7 GPG to maintain heat exchanger warranty coverage.