Farm A was treated by continual addition of SPC under normal flow. This method provided a spatially consistent but highly temporally variable dose and was below the target dose in all sections and at most times due to dilution of the product and poor matching of product addition with flowrate. reported under-dosing in incubators using liquid HP, caused by dilution of the product as is moved through the system. also noted that dilution andvariable flow patterns caused under-dosing when applying liquid HP to in coming water in connected flow-through raceway.