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THESE ARE PUMPS THAT YOU HOOK INTO YOUR WATER SYSTEM FOR YOUR GREEHNOUSE OR GARDEN. THEY HAVE A HOSE THAT YOU PUT INTO A TANK OF LIQUID FERTILIZERSIMILAR TO MIRACLE GRO BUT MORE CONCENTRATED. IT SUCKS SOME OF THIS FERTILIZER UP AND MIXES IT WITH YOUR WATER THAT YOU APPLY TO YOUR PLANTS SO THEY GET A STEADY CONSTANT FEEDING WHEN YOU WATER. IT MAKES A HUGE DIFFERENCE TO YOUR FLOWERS, VEGGIE PLANT...