Stupid ? Why did you leave out the explanation on pool water ? That info explains it well, I will take my chances with the ditch water .
https://www.usaberkeyfilters.com/faq/
Because it's absurd to market a water filter for "emergencies" and try and say you would drink water contaminated with kerosene or cadmium or other heavy metals and then say water that you swim in and play in shouldn't be used in an emergency?? Really and seriously you must be delusional. But you drink your ditch water from your Berkey.........
If it's only for tap water, it's not for emergencies, and if it can't filter clean pool water I'm not sure why anyone could rely on it to filter contaminated water with the chemicals it claims to filter. All except pool water apparently.
Compare; to the chemicals a pool "might" have that you swim in, get in your eyes and mouth etc.
Chemicals and contaminants commonly found in swimming pools include the following: pH increaser, pH decreaser, alkalinity increaser (sodium bicarbonate, baking soda), alkalinity decreaser (muriatic acid, sodium bisulfate), calcium hardness increaser, chlorine, bromine, biguanide, cyanuric acid, ammonia, saltwater, bacteria and other pathogens, algae, insects, and animal waste. The presence and concentrations of these chemical contaminants are dependent upon several factors including the types of pools, types of disinfectants used, disinfectant dosages, bather loads, temperature, and the pH of swimming pool waters.
The Black Berkey® Purification Element has been rigorously tested by independent third-party labs for the removal or reduction of contaminants such as herbicides, inorganic non-metals (including chlorine, and chloramine), pathogenic bacteria, parasites, pesticides, perfluorinated acid compounds, petroleum, pharmaceuticals, radiologicals, trihalomethanes, viruses, and volatile organic compounds.
In conclusion, in position on chlorine in a water source is that according to the test data, the Black Berkey® Purification Element appears to reduce greater than 99.9% of chlorine. With that being said, we do believe the elements will remove a chlorine threat given the facts of the test data. However, we would not recommend drinking pool water for regular consumption as it may contain additional contaminants or chemicals other than chlorine that may or may not have been previously tested by our vast catalog of independent third-party testing.