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Message: [QUOTE="Meyer Jordan, post: 307771, member: 7131"] Wetlands filters are usually considered as a 'water polishing' systems. They are designed for the removal of Nitrate, Phosphous, Heavy Metals and other pollutants from the water through the functions of plants. In some instances, these systems will also reduce the level of pathogenic organisms through natural predation. For this to efficiently occur sufficient dwell or resident time must exist. In constructed wetlands that are used for 'polishing' waste water, sewage or industrial, the generally accepted optimum flow rate is 21,000 gallon per day/acre.which is an extremely low flow rate. [/QUOTE]