The bar staff must be properly trained to pour beer, clean and store glassware, and to recognize and report pouring problems.
Would your staff know what to do if the beer is pouring too fast, or is foamy? Certainly it cannot be fixed if it is not reported. Customers will let the server or bartender know if the beer does not taste right. Never pour from a system that is not working properly as this will waste beer and loose customers.
Happy well trained staff will mean happy contented customers!