Certain restrictions apply to the sale and marketing of Doulton® and British Berkefeld® water filters in the states of California, Iowa and Wisconsin. In these states, under the Doulton® brand name, only the Doulton® HIP/Ultracarb® Inline, Doulton® QT/Ultracarb® Inline and Doulton® Ultracarb® elements have been tested and certified for sale

In these states the following filtration claims are made for these products:

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