Right-size the unit, price the install correctly, and know your total before you show up—so the quote isn't a guess and the job isn't a loss.
Undersizing causes the unit to regenerate daily, burning through salt and wearing out the resin faster. Oversizing means it goes weeks between regenerations, and stale resin grows bacteria. The formula is simple: people × 75 GPD × hardness GPG × 7 days = grain capacity needed per week. Size to regenerate every 6–8 days.
Above 2 ppm iron, standard resin degrades fast. Price in iron-rated resin or a dedicated iron pre-filter. Quoting without asking about iron is how you get callbacks 18 months later when the resin is fouled and the homeowner thinks you installed a bad unit.
Salt-free TAC systems prevent scale without removing minerals—water still feels "hard" but appliances are protected. They're ideal for HOA areas that ban salt discharge, or customers on low-sodium diets. They cost more upfront and require zero maintenance salt—a genuine upsell, not a compromise.
The Plumber's Business Starter Kit includes a flat-rate price book for 40 common plumbing jobs, a service agreement template, and a morning dispatch checklist. Guide from $19 — Complete Kit with all 19 templates, $49.
Get the Plumber's Kit →Water softener installation pricing includes the unit markup, bypass valve, drain connection, salt, electrical work if needed, and startup service. This calculator builds the complete installed price so you can quote softener jobs confidently — and identifies the upsell opportunity when pre-filtration or a dedicated drinking water line is warranted.