the same requirements as regards screened substances as in other oenological preparations, and heavy metals in particular.
the level of revivifiable lactic bacteria must be 108/g or 107/ml or more;
the level of lactic bacteria of a species different from the strain or strains indicated must be less than 0,01 % of the total revivifiable lactic bacteria;
the level of aerobic bacteria must be less than 103 per gram of powder or per millilitre;
the total yeast content must be less than 103 per gram of powder or per millilitre;
the mould content must be less than 103 per gram of powder or per millilitre.