Once upon a time, back when people smoked in airplanes and thought preservatives made food taste better, toilets used as much as 7 gallons of water per flush.

Then, in 1992, someone somewhere thought, “Uh guys? Is this really a good idea?" The Energy Policy Act was signed into law, and low-flush (aka "low flow") toilets that use no more than 1.6 gallons of water per flush were declared the new standard in the U.S. Instead of relying on gravity—and lots of H2O—to wash things down, low-flow toilets use pressurized air to do the dirty work of pushing waste into the pipes.

But have low-flow toilets truly unseated their old-school porcelain counterparts in this game of thrones? We've flushed out the truth. 

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