Once the water drains into the growbeds it goes through the paint cap & lemonade container filters and back into the Fish barrel. The process starts all over again. Here there are paint caps setting inside the lomonade\rock filter. The paint caps are cutout in the center and have holes drilled in it to let water through. A toothpick is in place to keep the PVC pipe from pushing the screen and Bird gravel out. I used bird gravel because it has oyster shells and activated carbon in it.
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