I've stopped using ours for the most part. Although, I don't understand why boiling water would be a problem.
Try watering houseplants with microwaved water (once it cools obviously).
A fair comparison would be to separately try watering with stove top boiled water too. In fact, do a blind test with all 3 types to keep any bias out.
If you even briefly skimmed the paper, you would see that is exactly what happened.
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