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Are there special instructions when using empty water like Distilled Water?

Yes. Since empty water (e.g. Distilled Water, Reverse Osmosis Water, Deionized Water, etc) does not have chemicals to reduce bacteria growth (NCBI) it must be handled differently. This type of bacteria is not typically harmful but can cause a biofilm to develop on the inside of storage containers or filtration systems. 

Tips for dealing with biofilm:

  1. Store empty water (mixed or unmixed) in sealed containers.
  2. Clean and sanitize any container used to store empty water (mixed or unmixed) routinely; every time the container is used. This includes routinely cleaning water reservoirs for espresso machines, hot water towers, coffee batch brewers, etc.
  3. Do not store empty water in clear containers in direct sunlight.
  4. Change filters for Reverse Osmosis and similar systems regularly. (EPA) Often, bacteria may propagate inside of these systems when exiting the filters.

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