Vegetable Filters for aquarium filtration: "Designing and tuning your own system will depend upon tank sizes and the pump chosen. In any case, in the event of a power outage or pump failure, the maximum water level in the lower tank must be set low enough to absorb the difference between the upper tank level with the pump on and the level with the pump off. With the overflow I have in place, this difference is just about 3/8" in the upper tank, about 1/2" in the lower. The difference is due in part to the positive meniscus in the upper tank. This level is marked on the glass of the lower tank by a tape line. I also mark the normal (lower) operating level with the pump running. When topping up the system during pump operation, this latter (lower) level is the guide. Filling the lower tank above this level could result in overflow during any power failure. This too is critical to the operation of the system."
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