Hello, when we manually prepare the 2216 medium, a slight precipitate forms. This is normal as far as we have reviewed in the literature. The problem is that after 2 weeks of storage, the medium begins to precipitate too much and becomes completely cloudy. It is not a problem of microbial contamination because we have plated said medium and no microbe grows. So we have doubts about the lifetime of the medium once it has been prepared. Thank you very much in advance
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