Dear Chauke,
The hazards from rusty equipments (any equipment used for food preparation) can lead to physical, chemical and microbiological hazards which can cause adverse health effects. The ice which is an ingredient in your food preparation process has to be safe and made from an ice-machine working in sound condition.
I have heard of complaints because of parts from equipment like plastic or bolts etc. going into food from rusty equipments and this has caused choking in some cases. Metal shavings and sediments have resulted due to rust formation in water / ice.
The chemical hazards can be with heavy metals lead, cadmium etc depending on the metal used for making the pipelines and fittings.
The minerals in the water get concentrated as it becomes ice and leads to scale build up can result due and this can result in high energy and maintenance cost.
The rust can affect the taste, off colours and odour and other quality issues. If the water pipelines are rusty, water will be more turbid and this will interfere with the purification and disinfection, resulting in high TDS and this will make the ice cubes cloudy, softer & will melt faster.
Iron bacteria can be found in rust or particles of iron which leads to pipe corrosions. Though ice is not a PHF, it can carry organisms which can cause illness as the organism is live. Algal growth is possible in un-cleaned and rusty equipments.
In short, if the ice is contaminated this will result in the contamination of all the foods products being processed using the contaminated source.
So as the others have said, it’s essential to consider the rust in your ice-machine and ensure the necessary steps are taken to prevent the contamination.
Best regards,
J