By tweaking his filtration system to leave a certain amount of fish waste in the water, plants can be grown in the same tank.

他通过对他的过滤系统进行调整，保留一定量的鱼的排泄物在水里，这样的话，植物就可以和鱼共生于一池了。

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"We're talking plants floating on the surface of the water, using the fish waste as nutrition," he explains.

“我们要说的是水生植物漂浮在水面上，使用鱼的排泄物作为营养源，”他解释道。

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Usually these pipes take waste water to treatment plants. But any overflow is released into rivers and streams.

通常这些管道都将污水送往污水处理厂，但还有些污水溢流到河流和小溪之中。

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For instance, water pumps and waste water treatment plants rely on electricity, so when power is lost for long periods of time, reserves are depleted and bottled water must be transported into the zone, usually by truck.

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Buenos Aires and its suburbs have only three waste-water treatment plants for 10m residents, and often suffer flash floods that drench entire avenues.

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Water purification plants (especially in large cities which recycle their sewage waste right back into the drinking supply) will hopefully get prioritized for energy allocations when rationing starts.

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