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Message: [QUOTE="Mucky_Waters, post: 308024, member: 3859"] I believe Addy's bog utilizes plant nutrient uptake as well. Anyway, I'm following your logic a little better now, however, I still think a one pass wetlands filter is an inappropriate guideline to apply on a recirculating bog system. When a biological filter is employed in a recirculating system we don't expect all nitrogen conversion to happen in one pass. Nor does it makes sense for us to expect the plants to have to absorb all the nutrient in the water in one pass in a [I]recirculating [/I]bog system. Perhaps some sort of recirculating hydroponic system would have more appropriate guideline for dwell times for the most efficient nutrient uptake. [/QUOTE]