No pesticides or herbicides should be used during the cultivation of Spirulina. Even though the medium's high pH discourages the persistence of many pesticide compounds,36 it is imperative to monitor for pesticides periodically in the product. Measurements of pesticides in source water and culture water and conducting pesticide bioassays are normally used to monitor pesticide levels. Periodic analysis of more than 30 different pesticides in independent laboratories has failed to show any detectable levels of these compounds.

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