| PPMⓘ PPM (Parts per million) Parts per million (ppm) is the number of units of mass of a contaminant per million units of total mass. |
0-17 | 17-60 | 60-120 | 120-172 | 172+ |
| GPGⓘ GPG (Grains Per Gallons) Grains per gallon is a unit used to express the hardness of water, specifically the concentration of calcium and magnesium ions. One grain is equivalent to approximately 17.1 milligrams of calcium carbonate. |
0-1 | 1-3.5 | 3.5-7 | 7-10 | 10+ |
| WATER HARDNESSⓘ Water Hardness Water hardness refers to the concentration of dissolved minerals, primarily calcium and magnesium ions, in water. These minerals are naturally present in many water sources and can affect the water's properties and its interactions with other substances. |
Softⓘ Soft  Water that has most likely been softened with a water softener. |
Slightly Softⓘ Slightly Soft  Softener RecommendedYou will experience spotty dishes, stains on faucet and dry skin. |
Moderately Hardⓘ Moderately Hard  Softener RecommendedSpotting on dishes and minor faucet stains will be observed, especially if cleaning is not done regularly. Dry skin might occur. |
Hardⓘ Hard  Softener RequiredNoticeable staining on shower doors, glassware, faucets, pipes, and more. |
Very Hardⓘ Very Hard  Softener RequiredNoticeable staining on shower doors, glassware, faucets, |