Carbon RODI filters

[Reef.]

Just changed my carbon filter for my RODI unit, it say...

The filter will reduce free available chlorine (FAC) at 2 parts per million (ppm) by at least 75% in up to 50,000 gallons at a flow rate of 1 gallon per minute (gpm), and reduce 3 ppm chloramines by at least 75% in up to 1,000 gallons at a flow rate of 1 gpm.

Just wondering if the flow rate is less and the starting chlorine is 0.7ppm would that increase the reduction to more than the stated 75%?

 

[Randy Holmes-Farley Verified Community Expert]

Yes, I believe that a lower flow rate increases the contact time with the carbon block and so increases the chlorine removal.