The original question on this subject discussed costs associated with testing. An updated e-mail indicated that the $400/unit costs, which I thought were excessive, included biological testing. In that case I would recommend the following: Provided that: a) All systems are essentially the same b) All systems rely on the same water supply, and c) There are no know, or recurring problems Select an appropriate statistical sample, and on a weekly basis randomly select the appropriate number of units to test. Based on that sampling one should be able to identify problematic units, and/or establish a more precise sampling program. This should drastically reduce the number of units tested. This should, also, establish an appropriate due diligence program. Carl Zipfel csp EHS Management Systems LLC
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