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A boy taking a glass of water from a tap fitted with a device to purify water with ozone; advertising the Otto procedure of water purification by electricity. Colour lithograph by Goldstein, 1930.

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A boy taking a glass of water from a tap fitted with a device to purify water with ozone; advertising the Otto procedure of water purification by electricity. Colour lithograph by Goldstein, 1930.

Shouldn't the quality of your pure water be a constant rather than a variable? / Millipore Corporation.

Air and water : their impurities and purification / by Henry Bollman Condy.

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Active filters:

A boy taking a glass of water from a tap fitted with a device to purify water with ozone; advertising the Otto procedure of water purification by electricity. Colour lithograph by Goldstein, 1930.

Shouldn't the quality of your pure water be a constant rather than a variable? / Millipore Corporation.

Air and water : their impurities and purification / by Henry Bollman Condy.