OPTI-ACCEL ACCELERATOR & FROSTPROOFER 1LTR - OPTIACCEL1 OPTI-ACCEL is a one-shot, fast acting accelerator and frostproofer, offering all the usual OPTI-MIX benefits of accuracy, portability and convenience. - Fast acting formulation - Controlled dosage - Consistent mix design - Easy to use - No waste - 1 litre is equivalent to 5 litres of standard product - 250ml is equivalent to 2.5 litres of standard product