The production of Kosher for Pesach (KFP) matzos involves a great deal of meticulous work. The process begins with the inspection of wheat kernels to ensure that they have not been adversely affected by moisture in the air or prematurely sprouted. Grinding of the grain must be performed according to the dictates of halachah, which precludes any pre-grind soaking of the grain and requires special preparation of the milling equipment to ensure that no contamination exists from non-Passover flour in the grinders and filters. The KFP flour is then loaded onto trucks, either pneumatically or in bags under controlled conditions, and shipped to the bakeries.
A bakery which has been kashered for Pesach will have already prepared special water (mayim shelanu) to be used for Pesach matzos. Hand matzah bakeries do not use regular municipal water for fear that the chemicals added to the water may affect the leavening qualities […]