Your ice machine probably doesn’t get a second glance until something goes wrong. Â
On a hot summer’s day or a busy Friday night, you need it producing a steady supply of clean, clear ice for drinks, food displays and chilled desserts. If it slows down or stops altogether, you’ll soon feel it behind your bar or on your counter.Â
Limescale is one of the most common reasons ice machines start to struggle, particularly if your business is in a hard water area. Every time water passes through the machine, it leaves behind tiny mineral deposits. Over weeks and months, these build up on the parts that carry water and form your ice. The chalky marks you can see on the outside are often only a small part of the problem. Deposits inside the water system can interfere with water flow, slow ice production and leave you with cloudy or misshapen cubes.Â
Preventing limescale starts with assessing the water entering your machine and choosing a treatment that suits the model. That might mean a scale-control cartridge, a softener serving several appliances or a combination of treatments. You’ll still need to keep up with regular cleaning and descaling. On this page, we explain how to prevent limescale in your commercial ice machine.Â
Key Takeaways
- Check your machine’s water requirements in the manual before choosing any treatment.
- Test the water feeding your ice machine, as it may differ from your supplier’s postcode figure.
- Choose a treatment that tackles hardness, since sediment and carbon filters alone won’t stop limescale.
- Replace filter cartridges on time, based on months or litres, whichever limit comes first.
- Keep up regular cleaning and descaling, at least every six months, even with water treatment in place.
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01
Why limescale forms inside ice machines
Limescale forms when minerals dissolved in hard water collect as solid deposits. Calcium and magnesium contribute to water hardness. Rainwater picks up these minerals as it passes through rocks such as limestone and chalk.Â
Water is generally soft across much of Scotland and north-west England, while hard water is common in the Midlands and East Anglia. Local supplies vary across areas, though.Â
In ice machines that recirculate water, minerals can become concentrated in the water left behind as ice forms. Deposits can then build up on freezing surfaces and inside the system.Â
02
What water does your ice machine need?
Before choosing treatment, dig out your ice machine’s manual. If you don’t have a copy, search online using the full model reference on the rating plate. Look for its water-quality requirements and recommended treatment. Â
Your water supplier’s postcode checker will give you an indication of how hard the local water is. However, bear in mind that the water reaching your machine may already pass through a filter or softener elsewhere in the building.Â
Test the supply feeding your ice maker before deciding on the treatment. Keep the result and its units. Treatment instructions may specify total hardness or carbonate hardness, so the test needs to match the measurement required.Â
03
How do different water treatments work?
Once you know how hard the local water is, the next step is choosing the right treatment for your ice machine. Don’t assume any water filter will do the job, especially when you’re looking at a list of cartridges and systems that all promise better water. Each type of treatment works in a different way, and picking one that doesn’t tackle the problem means you could still end up with limescale building up inside your machine.Â
Understanding what each option does will help you choose the right treatment for your water and your ice machine and avoid paying for something that won’t give you the protection you need.Â
A sediment filter catches particles, while activated carbon reduces substances such as chlorine that affect taste and odour. However, those functions alone won’t remove any dissolved minerals that cause water hardness.Â
Some cartridges combine sediment and carbon filtration with limescale inhibition, helping to improve water quality while limiting scaly deposits.Â
A scale-inhibitor cartridge, often using polyphosphates, helps prevent calcium carbonate from forming hard deposits inside the ice machine. However, it doesn’t remove the minerals that make water hard.Â
A conventional water softener passes water through an ion-exchange resin, which captures the calcium and magnesium responsible for hardness and replaces them with sodium ions. You can also obtain reverse osmosis and deionisation systems, which go even further, removing a wider range of dissolved minerals.Â
However, not every ice machine is compatible with these treatments. For example, Diamond’s ICE70AS-R2 manual recommends a polyvalent cartridge filter for particularly hard water but explicitly prohibits reverse-osmosis and deionised water.Â
04
Would a shared water softener be worthwhile?
A shared softener may be worth considering if your other appliances also suffer from hard water. It can protect compatible dishwashers, water heaters and connected pipework, not to mention that all-important British staple, the kettle.Â
Assess your appliances together to confirm whether your ice machine can share the softened supply and identify any separate filtration it still needs. Keep an untreated drinking water tap where possible. Any softened water used for drinks, cooking or ice must still meet drinking water standards, including the sodium limit.Â
Whichever option you choose, it must deliver the required flow and pressure when your appliances run together. Some ice machines discharge water during purge or rinse cycles. If yours does this, account for the additional water use when sizing the treatment system. Check the manufacturer’s stated water consumption first, as it may already include these cycles.Â
05
Scale protection depends on maintenance
If your ice machine uses a water filter cartridge, record its model number and installation date so you know when it needs replacing. Manufacturers typically specify a maximum service life in months, a maximum volume of water in litres, or both. Replace the cartridge as soon as either limit is reached.Â
For example, a pub using more ice during summer may reach its filter’s litre limit months before its scheduled replacement date. If your filtration system has a water meter or replacement indicator, use it to monitor consumption.Â
When installing a new cartridge, flush it to the drain for the specified time or volume, where required, before restarting your ice machine.Â
A salt-regenerated softener needs salt top-ups and servicing. During regeneration, a salt solution restores the resin’s ability to capture calcium and magnesium, flushing the collected minerals to the drain. Have your installer set regeneration to suit water hardness and consumption. Make sure the ice machine will still receive suitable water during that cycle.Â
Some systems blend untreated water back into the treated supply. Your installer should set and record the blend to achieve the target hardness for your ice machine.Â
06
Descaling still needs its own schedule
Water treatment doesn’t replace descaling or cleaning your ice machine. Automatic rinsing, where fitted, doesn’t replace scheduled cleaning either.Â
We recommend a full ice-machine water-system clean at least every six months, although some models require more frequent cleaning. Â
Your staff should only carry out cleaning procedures they’re trained and permitted to perform. Book a qualified engineer where descaling requires access to internal components not intended for users. Use the approved cleaning products and concentrations, followed by the required rinsing and restart procedure. Don’t substitute kettle descaler or vinegar unless expressly permitted.Â
Between visits, clean the scoop and storage bin as your manual directs. Contact your engineer if you spot chalky deposits, falling output or changes in ice quality. If scale returns soon after descaling, review the suitability of the treatment, cartridge condition and descaling schedule.Â
At Catering Equipment Direct, we can connect you with qualified engineers for servicing and repairs. If your equipment is under warranty, we can also liaise with the manufacturer and arrange an authorised engineer where required.Â
Get in touch with your machine’s model and serial number, water-treatment details and descaling history so we can pass your enquiry to the relevant service team. Alternatively, browse our range of ice machines online.Â
