What is Wick system in Hydroponic culture?

Question

This is the most simple form of hydroponic system which requires no electricity., pumps or aerators. Among different types of Hydroponic systems, wick system is the only one that is a completely passive system which means no electricity is needed.
In most of the hydroponic systems, plants are placed in an absorbent grow medium like coco air, vermiculite or perlite, with a nylon wick running from the plants into a reservoir of nutrient solution.
Wick hydroponic systems work well only with small house plants and herbs as wick hydroponic systems will not supply enough nutrient solution to the plants.

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