I have been watering my plants and trees with the waste water. I only run through once each watering. Same batch of water goes through all 7 trays, then I take it outside for the plants. I do not recycle the water further.I don't see why not... but I have a feeling that it may depend on how many times you run the water through the fodder and what the condition of the fodder is. If you have even a small amount of mold trying to grow, you might have a worse problem on your hands if it gets to your animals, but if you can keep the fodder mold-free then I'd say GO FOR IT!