I have decided to use a peristaltic pump for the dispenser for the following:

Advantages:

• No insulation is needed as there is no contact with the fluid
• Can pump high viscosity with large solids.
• Fixed amount of fluid pumper per rotation, hence easy to estimate the rotations needed.
• Pump Design prevents backflow without the need for valves.
• Easy to maintain and clean.
• reverse rotation and flow direction are possible.

I will soon be sketching initial design drawing for the pump to use for my prototype.