this post was submitted on 16 Aug 2026
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[–] MouldyCat@feddit.uk 1 points 3 days ago

I also looked at this recently as I thought that soap would be harmful to plants and/or microbes and the Royal Horticultural Society has done some investigation of their own into the use of greywater, and their advice is "plants can be watered with shower, bath, kitchen and washing machine water (from rinse cycles)", finding that "soil and potting composts are effective at filtering out" the soap/detergent.

I'm just echoing what @Denjin@feddit.uk with the RHS link, and I didn't read the articles he linked but it wouldn't surprise me if the RHS guidance is the source of those.