medium · LSAT Logical Reasoning

Manufacturer: Our new water filter removes more contaminants than any competing model. We know this because in our laboratory tests it produced the clearest water, and clearer water is necessarily purer water.

Which one of the following is an assumption required by the manufacturer's argument?

  1. Clarity of water is at least a partial indicator of how many contaminants the water still contains.
  2. The new filter, on its own, removes every known contaminant from any water that is passed through it.
  3. Consumers care far more about the visual clarity of their drinking water than they do about its taste.
  4. No competing filter on the market has ever been subjected to the very same laboratory tests as this one.
  5. Laboratory test conditions perfectly replicate the everyday conditions of ordinary household water use.

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