What type of water conditioning do I need?

Done a water test with the results of:

Iron: 0 – 0.3 ppm
Copper: 0ppm
Chlorine: 0ppm
pH: 5-6
Alkalinity: 80-120ppm
Hardness: 15 grains/250ppm
Nitrate: 0ppm
Nitrite: 0ppm

We have well water, and at one point there was a water softener, but it was removed. I have been seeing very mild yellowing in sinks/bathtub.

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