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Message: [QUOTE="HARO, post: 232220, member: 3528"] Under-gravel filtration was touted as THE system for ponds, back in the late 50's and early 60's. When the pond went out for a few hours, people would lose all their fish! It seems once the water stops moving, the whole thing turns into a SEPTIC TANK! These systems are not used today for that very reason!! BTW, I knew one pet shop owner who was away at a convention when he got an urgent phone call saying that his large air pump was no longer working and that he had several dead fish. By the time he got there, he had lost every fish in the tanks serviced by that pump. All were fitted with undregravel filters! He used to swear by them.... now he swears AT them!! :mad: John [/QUOTE]