The performance was studied of a series of 2.2 m deep anaerobic, facultative and maturation ponds, which had an overall retention time of 25 days, and a mean mid-depth temperature of 25°C. The mean percentage removals of BOD, COD, suspended solids and faecal coliforms were 88, 69, 83 and 99.97 respectively; there was only 4 percent reduction of ammonia and 6 percent of total phosphorus. The results are compared with those previously reported for a similar series of 1 – 1.2 m deep ponds at the same site.

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