# Slower Bowls, Slower Boil: Five Early Signs of Scale

A commercial noodle machine handles water all day, so scale is unavoidable. It does not form overnight, but it does give warning signs. Catch them early and the fix is cheap; wait until the water barely boils and the layer has hardened, and cleaning becomes a job.


## Five early signs
One: water comes out slower. The same bowl takes longer to fill than it did when the machine was new. This is the earliest sign and the easiest to miss.

Two: heating is slower. The wait from start to boil, or from bowl in to bowl out, gets longer. Standard serving time across the three RamyCook models is 3 min 30 sec to 5 minutes depending on the menu. If it stays inside that range the heating surface is fine; if it drifts clearly beyond it, suspect scale on the heating surface.

Three: it gets noisier. A crackling or humming sound during heating that was not there before.

Four: the taste changes. The same noodles come out with a flatter, duller broth.

Five: white crystals at the drip tray or the water outlet. By the time you can see them, a layer has usually built up inside.

With any of the first four, schedule a descaling session. With the fifth — or with intermittent water flow or panel errors — stop using the machine and deal with it.


## How to descale
The machine has a built-in descaling function. Run it periodically according to your local water hardness: hard-water areas need shorter intervals. Use the signs above rather than a fixed calendar.


## Three things not to do
One: never scrape the heating surface with steel wool or a metal brush. Scratches become anchor points for the next layer, which then builds faster. Use a soft cloth or a plastic scraper.

Two: never use industrial-grade descaler. Food-grade citric acid is the common approach — follow the stated concentration and soak time, since going stronger or longer damages the plumbing.

Three: never skip the final rinse. Flush thoroughly with clean water before serving again; residue will show up in the next few bowls.


## Reduce scale at the source
Incoming water hardness sets the rate of scaling. All three RamyCook models are meant for a water purifier or bottled purified water, and direct connection to mains tap water is not recommended. The tank also needs more than 1 litre before the machine dispenses.

One last note: the heating surface stays hot after use. Cut the power before descaling and let it cool down first.


## Related reading
For tank capacity and water supply differences across the three models, see the product comparison. For routine cleaning, see the noodle cooker cleaning guide.