A buyer comparing two quotations for the same tonnage notices that one supplier asks for a water analysis and the other does not. That difference matters more than the price gap. Ice is water with the heat removed, so everything dissolved in the supply either ends up inside the cube or on the mould, and both outcomes show up as complaints within months: cloudy ice on the bar, and a machine that slowly takes longer and longer to release each slab.
The principle: minerals are pushed ahead of the ice front
When water freezes, the crystal lattice rejects dissolved salts and pushes them into the remaining liquid. On a cube machine, water circulates over the mould, so the concentrated liquid is continually diluted and partly flushed at harvest — which is why cube ice is normally clearer than block ice. When the mineral load is high, or when the flush path is obstructed, minerals are trapped in the cube as visible white streaks and haze. The same minerals precipitate on the coldest surface of the mould as calcium and magnesium carbonate, forming scale that insulates the metal from the refrigerant and mechanically grips the ice.
Two consequences follow, and both cost money. Scale slows heat transfer, so the freeze cycle lengthens; and scale roughens the release surface, so harvest slows. Neither shows a fault code. The machine simply produces less ice while drawing the same power.
What to test on site
The following ranges are general water-quality guidance for ice making rather than values measured on our machines; they are the questions to put to your water supplier or to a laboratory.
| Parameter | Typically acceptable | What happens above it |
|---|
| Total hardness as CaCO₃ | Roughly 50–150 mg/L | Scale on the mould, cloudy cubes, longer freeze |
| Total dissolved solids | Under about 300 mg/L | Hazy ice, taste carry-over |
| pH | 6.5–8.0 | Corrosion risk below, scale risk above |
| Chloride | Under about 100 mg/L | Pitting of stainless and plated surfaces |
| Iron and manganese | Under about 0.1 mg/L | Brown or black tint in cubes |
| Turbidity | Under about 1 NTU | Visible particles frozen into the cube |
| Free chlorine at the machine | Low and stable | Odour transfer, elastomer ageing |
Why our build matters here
Water touches the mould, the water curtain, the tank and the bin. Our cube machines use a copper-plated nickel ice mould, a copper fin condenser and, on the compact bar model, a PE tank; the bodies are stainless steel. Nickel plating gives a smooth release surface and good corrosion resistance, but it is a thin layer: aggressive water, excessive chlorine or abrasive cleaning will shorten its life, and a worn surface will hold ice even when the refrigeration circuit is perfect. That is why water treatment is not only about clarity; it protects the component that decides harvest quality.
Matching treatment to the problem
- Sediment filtration. A five micron cartridge upstream of everything else protects the inlet valve and the pump.
- Carbon block. Removes chlorine and taste compounds, protecting the nickel surface and the flavour of the cube.
- Softening or scale inhibition. Where hardness is above the range above, ion exchange gives the clearest ice; a food-grade scale inhibitor is a lower-maintenance compromise.
- Reverse osmosis. For premium clarity in cocktail and bottled-ice operations. Very low TDS water can taste flat, so some operators blend a little raw water back.
- Descaling schedule. Where no softener is fitted, a periodic food-grade acid clean of the mould and water circuit is normal maintenance, not a repair.
Six checks before you blame the machine
- Photograph the mould surface at each service. An even water film is the target; a chalky patch is the start of scale.
- Weigh ten cubes. Growing cube weight at the same thickness setting is an early sign of poor heat transfer.
- Time the harvest. Slow release with correct pressures points to surface condition, not refrigerant.
- Test supply water and finished ice separately once a year. If the ice carries more hardness than the supply, the flush is inadequate.
- Check the filter change date. An exhausted carbon block passes everything and adds nothing.
- Look at the bin drain. Water standing in the bin is not a water-quality problem, but it produces the same complaint.
FAQ
Does clear ice mean clean ice? Not necessarily. Clarity is about dissolved and suspended solids; hygiene depends on cleaning and sanitising the mould, curtain and bin.
Will a softener make ice too soft? It removes hardness, not temperature. Cube hardness is set by ice thickness and bin temperature.
Can I use filtered drinking water? If it is low in hardness and TDS, yes. A domestic filter that only removes chlorine will not stop scale.
How often should the mould be descaled? It depends entirely on your hardness and daily output; the honest answer is to inspect monthly and descale when the surface dulls or cube weight drifts.
Send us a water analysis and your daily output and we will suggest a treatment and descaling routine for the model you are considering. See the 100–500 kg/24h series, the 90 kg/24h bar unit, or the 500 kg R404A model, or send your water report.
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