The filter medium contained in the AZI ammonia filter will produce phosphoric acid if the material comes in contact with water. In the course of sampling, moisture vapor will be drawn through the filter. When the recommended intervals listed below are reached, the filter must be changed before harmful levels of acid are produced. Regardless of the humidity at the time and place of sampling operations, do not tip the filter on end but keep it level to prevent any accumulated liquid from escaping. Place the filter in a suitable container for proper disposal, refer to state and local laws. Ful MSDS for the filter medium is available from Perma Pure Inc. customer service. Read more
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