What is the typical backwash time for a surface water mixed media filter?
asked 6 March 2017 asked by turbidity (480 points)
The duration and frequency of the backwashes depends on the nature of your water. For example, a plant with a turbidity of 50 NTU compared to another that would have 5 would require much more frequent bakwash. It is not an established rule.
If it has high turbidity there will be frequent back washes. Typically 20 minutes is the back wash time but interval might increase or decrease by contaminants.