This is what is called gray water and has been used for watering since long before indoor plumbing. I think the key is to use very plain organic (no chemicals) soap like Castile or glycerin. Shampoo is another issue and I'd be hesitant there. I also would not spray plants with the gray water but use it to water the soil. Here is more info: https://www.gardeningknowhow.com/garden-how-to/watering/using-graywater-in-gardens.htm
Answered on July 1, 2018
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