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Biological washing powder contains enzymes which break down stains etc in the wash .Non Bio doesn't contain the enzymes.
In terms of the environmental impact, neither system is perfect. Whilst the enzymes contained in a biological wash powder may take longer to disperse in the environment, the temperatures for washing can be lower than for a non-biological powder. The non-bio powder could take a higher temperature to do the same wash, which uses more electricity and water and this also has an environmental impact.
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