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In our latest project, we'll be explaining how we installed the pump control system in an NFT hydroponics greenhouse. We're using the Rainbird ST8 2.0 irrigation controller with the Hunter Pump Start Relay and a 1.5hp submersible pump to run the irrigation system. The NFT system was done with 4x2.5" downspouts and 4x3" downspouts. Let us know what you think!