We also have well water and run it through 3 filters actually before it hits our dual softener and finally R/O for drinking water. Our well water is about 2200 ppm of TDS, we had it tested before installing all the house water system. They suggested if I did fill the pool to use the filtered / softened water. Fortunately we live on the bay of Green Bay, an inlet off Lake Michigan so I fill the pool with that water. A person who lives out near us but not on the water fillers theirs with rain collected from their roof, but had to initially truck in the majority of fill water.
Hopefully you well water isn't so bad, but without good testing it's hard to say. A local water place like Culligan or similar should be able to test your water relatively easily and let you know what’s in it.
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