A method may include receiving, by a first Ethernet interface, a message from a remote second Ethernet interface via an Ethernet operation, administration, or management channel. Therefore, the purification system has fast reaction rate between the pollutants of the flue-gas and the catalytic absorbent, which is preferably ammonia, to efficiently remove pollutants, so as to effectively purify the flue-gas. A pressure transducer 70 measures the cell 30, 40 pressure. The clockfrequency reference is intentionally offset by fractional frequency resulting in a beat frequency when compared to the incoming data.