A spreader mat is used to line the bed of the tray when using NFT systems, breaking the surface tension of the nutrient solution. The mat is made from finely layered fibre strands and this ensures that the solution spreads even across the surface of the top tray, hitting the roots evenly throughout.
Spreader mats are particularly useful when growing in tray systems, and are highly recommended for use with NFT Grotanks but they can also be used as a base layer for pots to stop substrates from leaking out.
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