| http://www.w3.org/ns/prov#value | - dechlorination, pH testing and control, alkalinity testing and control, nitrate testing and control, nitrite testing and control and ammonia testing and control, proprietary water conditioners and additives, such as trace elements, by way of example and as are known in the art.After treatment, water is returned to tank 12 via output lines 60, 62 and 64 by gravity feed.
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