Fix watery slush in minutes

Nine times out of ten it is too much sugar. Above 15° Brix, sugar acts like antifreeze and stops the mix from setting in a home machine. The other common culprits are too much alcohol and a warm or under-filled machine. Check Brix first, then alcohol, then the machine.

No. Ice melts in the warm barrel, adds water, and lowers your Brix even further — which usually makes the texture worse, not better. Instead, dilute a too-sweet mix with water or unsweetened base to drop the Brix, or add sugar if the problem is that it froze into a solid block.

You almost never need to dump the batch. For every 1L of soupy mix in the hopper, stir in about 250ml of water or unsweetened base to pull the Brix down toward 13–15°, then give it 20 minutes to re-freeze. If it was the alcohol, dilute with more non-alcoholic base. Re-read and repeat in small steps rather than over-correcting.

Aim for 13–15° Brix. Below that the mix freezes too hard into an icy block; above it, the sugar keeps it soupy and it never sets. The 13–15° window gives you the scoopable, spoon-standing texture you want. A refractometer or the Slushable app makes this easy to dial in.

There is no fixed cutoff — it depends on your machine and how much sugar you add to balance it. Alcohol lowers the freezing point, so the more you pour in, the harder the batch is to set, and too much will stop a home machine freezing it at all. Offset each 1.5oz shot with about 12–15g of extra sugar, keep the booze moderate, and pre-chill the spirits so the machine is not fighting warm alcohol.

Measure everything before it goes in: target 13–15° Brix, keep the alcohol moderate and balanced with sugar, and pre-chill the mix 2–4 hours to shave 10–15 minutes off the freeze. Keep the hopper 80–90% full and the vents clear. Running the numbers in Fix My Slush before you start is the surest way to avoid soup.