I'd like to maximize rainwater reuse in my household. I want to wash the dishes and take a bath/shower with the water, as well as supply a washing machine with it. Wikipedia states, that acid rain is not dangerous for humans. Is physical particle filter enough for treatment? Is water collected from steel roof a problem, compared to water collected from extensive green roof?

  • What is a "green roof" ? I remove leaves, twigs, etc , and use rain water for aquariums and plants. I often get mosquito larva in my plastic storage barrel, big plus for aquariums. Mar 29, 2022 at 14:50
  • I'm familiar with homemade 430 stainless-steel roof coverings. That's 0.028" thickness lateral-side-lapping strips with lateral attachment slots cut in it. Material flattening is not required until forming ridge shapes. Hold-downs are needed at the gable-ends. Or standing-seam panels could be formed with 0.015" thickness. The 430 is not painted and will not rust. Well, it will rust if touched with a cut-off disk but not rust if touched with a grinding wheel or if touched with a SS brush. I think I would use the water off the roof for toilet flushing.
    – S Spring
    Mar 30, 2022 at 0:41
  • The 430 roof covering lowers the house temperature during summertime. Or steel roofs are available with a granulated paint for the same purpose.
    – S Spring
    Mar 30, 2022 at 0:50
  • @blacksmith37, green roof is a roof with plants on it: Green roof Apr 4, 2022 at 12:33
  • Often the problem is not the rain and how it is collected, but how the water is stored. A few years ago, clay water fountains were popular in the region where I live. People with tendencies towards allergies often became sick drinking this water. Black mold growing between the clay particles was discovered to be the culprit.
    – MocBird
    Dec 7, 2022 at 1:24


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