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Try a solid soap that suits you
A concentrated product can reduce packaging and transported water.
What changes the result
The comparison depends on formulation, amount used and the whole washing routine.
Check what you already own before buying something. The benefit comes from repeated use.
References in the original project +
Koehler & Wildbolz (2009) Env. Sci. & Tech.; UNEP (2021)
These bibliographic references come from the original cards. They provide context; they do not validate every numerical assumption below.
