When procuring a horizontal crystallizer, focus on the cooling/heating surface area and the agitation mechanism. Ensure the equipment features a high-efficiency jacket or internal cooling coils to maintain precise temperature gradients. The material of construction is critical; for corrosive chemical processes, specify SS316L, Hastelloy, or titanium-lined vessels. Additionally, verify the motor power and torque of the horizontal agitator to ensure it can handle increasing slurry density as crystals grow without stalling.