What water ratio should be used for refractory castable mixes?

The water ratio should follow the specific refractory manufacturer's data sheet exactly, since even small deviations affect final strength and thermal performance far more than with standard concrete. Overwatering to improve workability is a common site mistake that weakens the finished lining and shortens its service life. Mixers should be calibrated for accurate water dosing rather than relying on operator judgment by eye. Sparkline Group supplies mixers configured for precise water dosing to help crews maintain manufacturer-specified tolerances.