HomeWaterCalc: Water treatment, with the numbers exposed

Field notes

The site organizes residential treatment decisions around measured inputs such as hardness, household size, fixture count, and rated cartridge capacity. Its softener material distinguishes nameplate capacity from working capacity and includes regeneration intervals from three to fourteen days, while the broader reference set covers filter flow, reverse-osmosis output, drain ratios, tank drawdown, UV dose, and contaminant thresholds. The homepage also separates city-water and well-water pathways rather than applying one equipment ladder to both.