First Water Systems – based in Marietta, Georgia – makes AC/Solar systems for pumping, water purification and re-use. Some are designed for fixed installation, others for mobile use by disaster responders. The OutPost-4, which can easily be carried in a pickup truck or trailer, is solar-powered, and can process 4 gallons per minute – 720 [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.