Hi Bill,

That squares with what I gleaned from the design folks. They wanted adequate contact time, even flow through the filter media (no short-circuiting or no-flow zones) and redundency for when break-through occurred. To those ends they would match the system capacity to the design flow and contaminant concentrations. A typical system would have parallel in-line pairs of carbon vessels. When breakthrough occurred at the lead vessel, the carbon would be replaced and it would be switched to be the trailing vessel.

The carbon business is a good one!

Cheers,