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Dear N.J.Suresh,

The choice of material indicated by the contractor is acceptable since, you have indicated the mix of sewage in a coastal area. Cast iron is easily susceptible to rusting in coastal environment and galvanizing is a better option. However, things have changed recently with availability of HDPE pipes (high density polyethylene pipes) which can be used under a wide variety of conditions.

With regards,

M. Karthik
Scientist C
Waste Water Technology Division (WWT)
National Environmental Engineering Research Institute


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