How is a 100 ml suspension prepared from the Pinewood Healthcare erythromycin 250 mg/5 ml Sugar Free granules for oral suspension product?

To prepare 100 ml of suspension from the Pinewood Healthcare erythromycin 250 mg/5 ml Sugar Free granules for oral suspension product, first shake the bottle to loosen the powder, add 80 ml water and shake vigorously until the granules are fully suspended, producing a yellow suspension.