Most water softener sales visits end with a set of spoken promises. The rep says the unit will handle the whole house, that the warranty covers everything, that the water test is free, or that the system will cut your salt use. Some of those statements may be true and some may not, but none of them is the contract. The contract is the signed order, the written proposal, and any attachment that is named in those documents. If a claim is not on that paper, you should assume you cannot count on it later.

Write down each claim as you hear it

Keep a running list during the visit, on paper or in your phone. You do not need to argue with anyone while you write. Just capture the exact wording as closely as you can. Useful categories include capacity (what household size or daily water use the unit is sized for), the result you were promised (what hardness level the softened water will reach), salt and service claims, warranty terms, install timing, removal and cancellation, and any statement that your existing plumbing is fine as it is.

Ask which document carries each claim

Go down your list one line at a time and ask a single question: which page says this? If the answer is that the rep will make a note, or that it is standard practice, ask them to add the line to the written proposal and initial it. Then ask the company to name the document that governs the purchase and whether that document overrides anything said in the sales presentation. A company that is confident in its service will not mind putting its promises on paper.

Match the proposal to the order form

Before you sign, put the proposal and the order form side by side. Check the model and tank size, the resin type, the bypass valve, the connection work, delivery and install fees, tax, the deposit, the payment schedule, and any financing terms. Mismatches between these two documents are common enough that you should compare them line by line rather than skimming for the total. If the total is right but one line item changed, that change is still a change.

Put a number on the soft words

Some words sound precise but leave the important details open. Ask the rep to define each one in writing:

  • Lifetime - whose lifetime, which parts are covered, and what is excluded.
  • Unlimited service - does that include labor, travel time, parts, and salt, or only some of them?
  • Free water test - is it a full laboratory analysis or a quick strip check, and who interprets the result?
  • Guaranteed soft water - soft to what hardness level, measured how, and at which tap?
  • Up to - if a figure is given as a maximum, ask what a typical result looks like too.

When the rep will not put it in writing

If a rep refuses to put a claim on paper, treat that refusal as information. You can ask for a short pause to review the documents, or you can decline to sign that day. Do not sign a contract that refers to standard terms you have not seen. Ask for a copy of those terms before you commit, then read the sections on cancellation, refunds, and what happens if the install cannot be completed as described.

The short check before you sign

Use this list as your final pass:

  • Every claim on your list appears in the signed proposal or in a named attachment.
  • The warranty is a separate written document, and you have a copy in hand.
  • The deposit, the total, and the payment schedule match what you were told.
  • The install date, the crew, and the steps for a missed date are written down.
  • You know exactly who to call after the install and how to reach them.

If you are still building a shortlist, start with the Best Water Softener Companies in St. Louis page. The How We Rate Water Softener Companies page explains what we look at when we compare them, including how clearly a company puts its terms in writing.