Size water softeners for Florida's hard water (Biscayne & Floridan Aquifer). Calculate grain capacity, salt usage, and build a whole-house filter system for FL's unique water chemistry
FL WATER HARDNESS TABLEFormula: Required grain capacity = (People × GPD × hardness GPG × regen days) ÷ efficiency (0.85). Hardness in Grains Per Gallon: 1 GPG = 17.1 mg/L (ppm). Iron adds ~4 GPG equivalent per 1 ppm.
| Grain Capacity | Tank Size | Best For (FL) | Salt/Regen |
|---|---|---|---|
| 24,000 | 8"×44" | 1–2 people, <10 GPG | 6–7 lbs |
| 32,000 | 9"×48" | 2–3 people, 8–12 GPG | 8–9 lbs |
| 40,000 | 10"×54" | 3–4 people, 10–15 GPG (most FL) | 9–10 lbs |
| 48,000 | 10"×54" | 4 people, 12–18 GPG (South FL) | 10–12 lbs |
| 64,000 | 12"×52" | 4–5 people, 15–22 GPG or iron | 14–16 lbs |
| 80,000 | 13"×54" | 5–6 people, very hard or iron-rich | 16–18 lbs |
| 96,000+ | 14"×65" | Large family; Collier/Lee very hard | 20+ lbs |
| Salt Type | Purity | FL Recommendation |
|---|---|---|
| Solar salt crystals | 99.6% | Not recommended — high insoluble content causes salt bridges and mushing in FL humidity |
| Rock salt | 98–99% | Avoid — high residue; clogs brine tank; frequent cleaning required |
| Evaporated pellets | 99.9% | ✅ Best for FL — nearly pure, minimal bridge risk, clean brine tank |
| Potassium chloride | 99%+ | ✅ Good if avoiding sodium; 15–20% less efficient; size softener up one tier |
| Iron-out resin cleaner | Additive | Use monthly if iron >0.5 ppm to prevent resin bead fouling |
Select the water problems you're experiencing. We'll recommend the right filter sequence for Florida's water chemistry.
Biscayne Aquifer (South FL): Highly porous limestone/coral rock underlying Miami-Dade, Broward, and southern Palm Beach Counties. Very shallow (surface to 120 ft). High hardness (15–22 GPG) from contact with limestone. Most South FL municipal water comes from this aquifer — treated but still very hard. A water softener is essentially mandatory for appliance protection in Biscayne Aquifer counties.
Upper Floridan Aquifer (Central/North FL): Deep artesian limestone aquifer (50–1,200 ft depth) underlying most of the FL peninsula. Moderate hardness (6–14 GPG) but often contains hydrogen sulfide (H₂S) gas from sulfur-reducing bacteria — causing the classic rotten-egg smell associated with many FL private wells and some Central FL municipal supplies.
Chloramine vs. Chlorine in FL Municipal Water: South Florida utilities (Miami-Dade Water, Broward County, Hillsborough) use chloramine (chlorine + ammonia) disinfection instead of free chlorine. Chloramine is more stable in FL's warm climate but does NOT respond to standard carbon filters. Catalytic carbon or Vitamin C (ascorbic acid) filters are required. Standard Brita-style pitcher filters do NOT remove chloramine — a common misconception in FL.
| Appliance | Without Softener (FL) | With Softener |
|---|---|---|
| Tank water heater | 7–10 yr life; 30–40% efficiency loss from scale | 12–15 yr; maintained efficiency |
| Tankless water heater | 3–5 yr to first descale; heat exchanger damage | 10–15 yr without descaling |
| Dishwasher | Cloudy dishes; 5–8 yr life from scale | Spot-free dishes; 12+ yr life |
| Washing machine | Requires 30–40% more detergent; stiff fabrics | Normal use; softer fabrics |
| Shower glass / fixtures | Permanent scale in 6–12 months; $200–$600 to restore | No scale; easy cleaning |
| Skin / hair | Dry skin, brittle hair from mineral deposits | Noticeably softer skin and hair |
| Annual soap/detergent | ~$800–$1,200/yr extra (hard water inefficiency) | ~$400–$600/yr |
Licensed FL plumber and certified water treatment specialist. Free in-home water test, softener sizing, whole-house filtration, and RO drinking systems — sold, installed, and warranted.
Our complimentary in-home water test measures: Total Hardness (GPG and mg/L), Iron (ferrous and ferric), pH, Total Dissolved Solids (TDS), Chlorine / Chloramine presence, Hydrogen Sulfide odor, Manganese, and Turbidity. Results take 10 minutes on-site and we'll recommend the right treatment system with written pricing — no obligation, no pressure. FL-licensed water treatment contractor.
Built for Florida homes - accounting for Florida's hard water, humidity, private well water, and county permitting.
Serving Palm Beach County & Florida - get matched with a licensed plumber
On this page, Florida water softener sizing estimates run about $800-$2,500, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
In Florida, minor maintenance may be DIY, but anything beyond that generally calls for a licensed plumber, and many jobs require a permit and inspection. When a permit, gas work, or your main water or drain lines are involved, hire a Florida-licensed plumber.
It depends on the cause and your specific policy. Sudden, accidental damage is more often covered than gradual wear-and-tear or maintenance - confirm the details with your insurer.
Timelines depend on scope - many routine jobs take a few hours to a day, while larger projects run longer. Your licensed plumber can confirm after assessing your home.
Planning estimate, not a quote — confirm with a licensed Florida plumber. Confidence is qualitative: ranges reflect this page’s Florida assumptions, not a guaranteed price.
Estimates on this page are Florida-specific and reflect Water Softener Sizing for typical Florida homes.
From this page: On this page, Florida water softener sizing estimates run about $800-$2,500, depending on home size, materials, and project scope. Use the calculator above for a Florida-specific estimate.
Your actual cost depends on your home's condition, layout, and local labor and permit rates.
From this page: Pricing depends on the size and layout of your home, the pipe materials and fixtures you choose, your Florida region and local labor rates, and permit fees. Work that is more complex or harder to access generally costs more.
Generally raises cost: harder access, older homes, added permits and inspections, premium fixtures or materials, and emergency or after-hours work.
Generally lowers cost: easy access, bundling several items in one visit, standard fixtures, and off-peak scheduling.
Curated Florida tools and resources related to this page.
Last reviewed: July 1, 2026 (US Eastern)
Reviewed by the FL Plumbing Tools editorial team.
Sources: Florida plumbing cost research and Florida Building Code / local authority-having-jurisdiction (AHJ) permit references.
Florida reference: Estimates and guidance reflect Florida labor rates, permitting, hard water, humidity, and coastal conditions.
Updates: Reviewed periodically and updated as Florida codes, permit fees, and market rates change.