Build a short equipment history
Record model, age if known, recent changes, service dates and the symptom. A salt bridge, control problem and exhausted media are different repair categories. Ask for the diagnosed cause rather than accepting age as the only reason to replace equipment.
Compare complete costs
Have both options describe labor, components, warranty terms, plumbing changes and recurring service. A replacement can make sense when capacity or serviceability no longer fits, but that conclusion should be explicit. A low repair price that excludes a necessary second visit is difficult to compare.
Use an acceptance check
Agree on the result that closes the job: treated hardness, restored flow or an appropriate target-specific check. Keep baseline and startup evidence. Do not assume that replacing one stage also repairs a separate drinking-water system, heater or pump.
The raw well and backwash supply
On a Loxahatchee private-well property, keep the well, pump and existing treatment sequence in the same assessment. Photograph each stage in the direction of flow and label any sample point before the equipment. Describe whether the well also supplies irrigation and whether the household notices changes while other water is running. Raw-well testing and available maintenance flow can alter the proposed sequence. A municipal city report or a neighbor’s installation does not specify your well system.