> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/epoc-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/epoc-user-manual/troubleshooting/saline-solution.md).

# Saline Solution

Each headset is packed with a small bottle of multipurpose contact lens solution. When this is exhausted, you can purchase from your local drug store or pharmacy. We recommend the use of contact lens solution if possible; but please do not use contact cleaning or sterilizing solutions. Multi-purpose solution contains non-allergenic anti-microbial agents which helps to keep your sensors fresh and prevent transfer of microbes between users. 

A saline solution between 0.7% - 4% w-w sodium chloride can also be used, but we recommend adding a small quantity (< 4% by volume) of a household disinfectant such as 70% iso-propyl alcohol.&#x20;

To reduce the rate of evaporation, add a couple of glycerin drops.


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