If you haven't frozen the ice brick since receiving your kit, that's okay. Just place the supplied ice brick in your freezer for at least 24 hours before you plan to collect your sample.
Please remember:
Only use the ice brick provided in your Microba collection kit.
Ensure the ice brick is completely frozen before packing your sample.
Do not substitute it with another ice brick or frozen pack.
This helps maintain the required temperature conditions while your sample is being transported to the laboratory.