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

The Ultimate Guide to Choosing the Right Water Softener Selecting the ideal water softener is more than just a purchase; it is an investment in your home’s plumbing, your appliances, and your personal well-being. Hard water, rich in calcium and magnesium, leads to scale buildup in pipes, "graying" of bathroom tiles, and dry skin or hair. To find the right system, you must balance your household's unique water chemistry with its daily consumption patterns. 1. Start with a Water Test

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