Occasionally, there were complaints about the cleaning result at the company MTR-Food in Mannheim. This affected in particular the rubber hoses, which are used for filling and draining the tanks. Black spots were increasingly found on the inner surface of the hose jacket. The replacement costs were up to €1,500 per complaint depending on the length and design of the foodstuff hoses.
The discolouration was caused by a strongly alkaline cleaning agent. This was replaced by Caramba TG 22. The weakly alkaline specialised cleaner proved to be effective especially with regard to the sensitive hoses and seals and was, at the same time, a gentle alternative for the material.
After switching to the slightly alkaline specialised cleaner Caramba TG 22, the complaint rate for tank interior cleaning dropped to almost zero. The related provisions for customer compensation were reduced by the same amount. In addition, the downtime for cleaning was reduced. Plus, an important contribution to greater occupational safety was made by not using strongly alkaline agents.