Final Recommendations
As these laboratory tests show, the performance of off-the-shelf gravity water filters varies significantly on the question of removal of toxic elements and heavy metals.

Both the Big Berkey and Zen Water Systems units performed very well, removing almost 100% of the toxic elements tested. Both units were easy to assemble and performed reliably during testing.

ProPur test results were disappointing, and the unit suffered from several problems possibly related to control control (wrong size screw for the lid knob, the release of excess aluminum by the filter element, and lead flushing problems when using the old, standard filters).

Crystal Drop and Doulton filters turned in the poorest performance of all and should not be used for the removal of toxic elements or heavy metals from water.

See more test results of countertop water filters…

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