Modeled totals by hardness band

Choose your water hardness band to see 12‑month and 5‑year totals for each common system type. Figures use the same transparent model and assumptions as the flagship comparison.

• Soft (0–3.5 gpg)
• Moderately hard (3.5–7 gpg)
• Hard (7–10.5 gpg)
• Very hard (10.5+ gpg)