Should a softener resin quote include diagnosis first?

I’d want hardness checked before and after a regeneration before pricing resin replacement. Comparing those results gives a better basis for deciding whether the regeneration cycle needs investigation or whether the resin remains a plausible cause; poor softening on its own doesn’t tell you which.

I’d treat age as context, not a cutoff: an older unit makes replacement less surprising, but I’d still want the proposed cause tied to the diagnosis. A clear service history can help show whether the unit has been regenerating and maintained consistently; if the history is sparse, I’d be more cautious about attributing poor softening to resin alone. Would you count the softener’s overall condition in that value judgment too?

Yes. Overall condition matters to whether the repair is worthwhile, though it doesn’t diagnose the resin. If the valve and rest of the unit seem sound, replacing resin might still make sense once the evidence points there; if several parts are worn, I’d be less inclined to invest in resin alone. I’d keep those as two separate judgments: what caused the poor softening, and whether the unit is worth repairing.

For example, if one quote proposes resin and another proposes valve work, I’d compare them by separating the diagnostic visit and findings from each repair’s parts and labor. That way, the customer can see whether both providers assessed the same issue and what each repair would cost, without treating either diagnosis as established just because it appears on a quote.