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-This aeroponic system could be run as a deep water culture by keeping the water level high in the grow troughs and plenty of oxygen as you folks mentioned.
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Just thought I would mention that running it as a water culture would require the air stones be in the tubes with the roots. This so the bubbles can come in direct contact with the roots and would probably be a nightmare to maintain, especially with roots growing down into the stones and clogging them. Also, I agree that if the roots are getting the moisture they need there shouldn't be any need to be soaked. But maybe they knew there was a problem with the misting system and wanted to compensate for it.