Water treatment equipment

Ion exchange softener. A resin tank plus a brine tank that regenerates on a timer or on demand. Fixr puts materials at $500–$2,000 and labor at $150–$1,000; HomeGuide puts installed salt-based systems at $1,200–$3,800 and dual-tank at $1,700–$5,000. Dual-tank matters if you need soft water continuously through a regeneration cycle.

Sediment and carbon filters. The workhorses. Whole-house carbon, mineral and sediment sets run $850–$1,400 installed. Cartridges are $15–$65 for carbon, sediment or iron media. These are the systems where standard-size cartridges versus proprietary ones makes a large long-term cost difference.

Reverse osmosis. Under-sink units run $300–$950; whole-house $4,800–$8,000. Filters are $30–$150 each every 6–12 months, membranes $40–$250 every 2–3 years, and whole-house RO elements $150–$250. UV sterilizers. Covered by NSF/ANSI 55, with Class A and Class B configurations that are not interchangeable — Class A is the more demanding rating. A whole-house set including UV runs $1,850–$2,900; lamps are $20–$100.

Water test kits. A DIY strip tells you roughly whether water is hard. It does not substitute for a lab. HomeGuide prices a basic professional hardness and water analysis at $130–$200, and the EPA points private well owners to state-certified labs, with local health departments sometimes testing at no cost. If you are making a four-figure decision, pay for the lab test.

How to choose

Check the certification listing yourself

WQA's Gold Seal is the industry's oldest third-party certification program and certifies to NSF/ANSI and NSF/ANSI/CAN standards. Look up the exact model, not the brand.

Prefer demand-initiated regeneration

NSF/ANSI 44 covers manual, automatic and demand-initiated regeneration. Demand-initiated units regenerate based on use rather than a clock, which is where the salt savings come from.

Ask what a replacement cartridge costs before you buy

A $15–$65 standard cartridge versus a proprietary one is the difference between a cheap decade and an expensive one.

Check whether a dedicated circuit is needed

HomeGuide puts a new dedicated electrical circuit at $250–$900 in labor and materials. That belongs on the quote, not in a change order.

Confirm there is a drain and a bypass valve

Softeners need somewhere to send regeneration discharge, and you want a bypass so a failed unit doesn't take your water with it.