What is productivity of over this filter how many gallons per minute. and how often you have to change cartridges after certain amount of time or after a certain amount of water used
The max flow rate for this unit is ~7GPM dependent on the water pressure and other factors.
These filters should be changed as a set.
The length of time these filters last is dependent on the amount of water consumed along with the conditions of the water. More contaminants means more frequent filter changes.
These filters should be replaced AT LEAST every 6-12months(closer to 6 on well water, 12 on municipal) or when the pressure delta is ~10-15psi, whichever comes first.