Priming chambers add a self-priming feature to a standard horizontal pump. A centrifugal pump by its principle is not self-priming, because of its limited ability to transport air. The priming chamber is initially filled with solution. The priming time depends on length/diameter of suction pipe. After the initial filling of the chamber, next time, the pump will automatically reprime. The maximum pump flowrate will be reduced by approximately 20%, compared to the published flow curve. The pressure/head will not be affected.