I am helping a friend with renewing a bathroom. He is looking at the possibility of storing and reusing the shower water for the garden.

What kind of filter do we need to install to make this possible? I suppose we need to remove the soap and any other particles. Is it even feasible in a simple way?

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    Research grey water – Gunner Jul 25 '17 at 14:57
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    Yes, it probably isn't even legal if you're in a city. – isherwood Jul 25 '17 at 15:00
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    You wouldn't normally try to remove soap, etc from grey water before it's used for garden watering. – brhans Jul 25 '17 at 15:03
  • You would not use any filter. Dilute soap is not harmful to a garden. I would expect that the problem would be harsh cleaners like chlorine bleach. Probably most of these greywater-to-garden plumbing arrangements would have valves to direct harmful cleaning compounds to the sanitary sewer. – Jim Stewart Jul 25 '17 at 16:17
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    They make soaps and shampoos which are more friendly to this. – Harper - Reinstate Monica Jul 25 '17 at 22:47

Step one is up to the local jurisdiction having authority - is this even legal in the specific place you want to do it? If not, fugeddaboutit.

After that there are many options - a reed bed filter is common in "permaculture" applications, a sand filter is another approach.

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