Brett is researching water filters to take on backpacking trips. Experience has
shown him that a backpacking filter should be compact and lightweight and should
filter water quickly. One source he found said the following: "Our 'Nature Series' is
the ideal backcountry filter and is the most economical method for producing pure
water. Our basic model is a five-gallon, stainless-steel tank. Our models might take
longer to filter water than those of our competitors, but the water quality is
phenomenal."
Why might Brett doubt the credibility of this source?
It is unlikely that a filter could process as much as five gallons of water at one time.
The source lists evidence that is too old to be trustworthy anymore.
The explanation of why the filter is good doesn't match what his experience has shown.