How to Set Glasswasher Rinse Aid Dosage Correctly: Fix Wet and Smeared Glasses
Wet glasses coming off the glasswasher is the number one complaint I hear from bar staff. Smeared pints on a Saturday night when you’re doing 180 covers is not a small problem. Nine times out of ten, the fix takes thirty seconds and a flat-head screwdriver.
The Drain Pump Rule First
Before you touch any dosing settings, check your drain pump is working. A glasswasher that isn’t fully evacuating dirty wash water will cause smearing no matter how much rinse aid you pump through it. Lift the lid mid-cycle, watch the drain phase, and confirm the chamber is clearing properly. If water is sitting in the bottom, you have a drain pump issue, not a rinse aid issue. Fix that first.
Running this problem at your pub?
Here's the system I use at The Teal Farm to fix it — real-time labour %, cash position, and VAT liability in one dashboard. 30-minute setup. £97 once, no monthly fees.
Get Pub Command Centre — £97 →No monthly fees. 30-day money-back guarantee. Built by a working pub landlord.
What Rinse Aid Actually Does
Rinse aid reduces the surface tension of the final hot rinse water. This makes water sheet off the glass rather than sitting in droplets. Droplets dry as smear marks. No rinse aid, or too little, and you get wet glasses that staff are wiping — which is both a hygiene risk and a time waster during service.
The Signs You’ve Got It Wrong
Too little rinse aid:
– Glasses come out wet
– Droplet marks dry on the glass
– Staff are constantly re-wiping
– Pints look cloudy when filled
Too much rinse aid:
– Glasses come out with a greasy or rainbow film
– Head on beer collapses faster than it should
– Glasses smell faintly chemical
– Customers comment on the taste
At Teal Farm, we had a period where the previous dosing setting was far too high. The head retention on our lagers was noticeably poor before we traced it back to overdosing. Cost us in product quality and credibility.
How to Adjust: The Quarter-Turn Method
Most under-counter glasswashers — Winterhalter, Hobart, Classeq — have a dosing pump on the rinse aid inlet, usually a small dial or screw adjuster on the peristaltic pump itself.
Step one: Locate the rinse aid dosing pump. It’s normally at the back of the machine, connected to the blue-capped rinse aid container.
Step two: Run a cycle and observe the results on a clean wine glass — they show faults most clearly.
Step three: If glasses are wet, turn the dial clockwise by a quarter turn. Run another cycle. Check again.
Step four: If glasses are smeared with film, turn anti-clockwise by a quarter turn. Run. Check.
Step five: Repeat in quarter-turn increments until glasses come out hot, dry, and clear within sixty seconds of the cycle ending.
One quarter turn at a time. Don’t jump to half-turns — you’ll overshoot and spend the next hour chasing it back.
The Check You Should Do Weekly
Pull a clean glass at the start of service. Hold it up to a light source. If you can see streaks or film, adjust before the rush, not during it.
Rinse aid dosing is a two-minute job that protects your glassware, your pints, and your reputation.
Before you sign anything, know your numbers. Pub Command Centre: real-time labour %, VAT and cash position from day one. £97 once. https://smartpubtools.com/5684-2/
Looking for a pub to take on? Browse our directory of 697 independently assessed UK pub opportunities — every one with real financial data and operator assessments. View the UK Pub Directory →