Answer
IMER's calculator assumes an output of 3 cu yd per hour, which is 81 cu ft. Divide 81 by the volume of a bag in cu ft to get bags per hour, then multiply by the water each bag needs (from the bag label) to get litres per hour for the flow meter. Example from IMER: a 50 lb bag that yields 0.375 cu ft and takes 1.75 L of water gives 216 bags an hour and about 380 L/hr. That assumes continuous feed. Always check the consistency when you start and trim the water valve. Product temperature, feed rate and the slump you want will all shift the result.
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Reviewed by our parts specialists from IMER manuals and parts books. Check the part number on your machine or in its parts book before you order. Not sure? Ask a parts specialist.