It appears that different sources of KH2PO4 used to prepare phosphate buffered dilution water have various effects on the ability of the dilution water to maintain a stable bacterial population. When the water used to prepare the dilution water is of either very good or very poor quality, the KH2PO4 source is of no consequence. However, if water of an intermediate quality is used, the KH2PO4 source becomes of consequence in the over-all quality of the system.

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