The first and most critical step is determining your water's hardness level, typically measured in grains per gallon (GPG). 0–3 GPG. Moderately Hard: 3.5–7 GPG.

Above 7.5 GPG (treatment is highly recommended). Very Hard: Above 16 GPG.

Different systems address hardness in various ways, each with its own trade-offs: How To Choose the BEST WATER SOFTENER For Your Family