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Chemical activity is poor, check for lack of enzyme cleaner and/or lack of high pH detergent

Fibrin Layer Remains
Chemical activity is poor,
check for lack of enzyme
cleaner and/or lack of high
pH detergent.

The system is cleaning water-soluble proteins but not the insoluble ones.  The chemical cleaning efficiency is low and the mechanical cleaning efficiency is not strong enough to overcome the deficit in chemical cleaning efficiency. 

The enzyme soak and/or the wash time is probably too short, or, if no enzymes are used, the pH of the detergent may be too low.  ProFormanceTM can come clean with neutral pH detergents and no enzyme soak but the water spray system must be very aggressive in order to mechanically scrub away insoluble proteins such as fibrin.  Mechanical action does not have to be quite so vigorous if an alkaline detergent is used.

Some alkaline detergents are just mildly alkaline.  A pH of 12 is needed to break down insoluble proteins.  Raising the temperature 20°F during the wash phase can more than double the efficiency of a high pH detergent.  Do not exceed 160°F. 

If enzymes are used, make sure the enzyme soak phase is performed in a temperature range of 110°F and 140°F.  High temperatures can destroy the cleaning capability of enzymes.  The longer the enzyme soak, the better.  Soak times of 10-15 minutes are best if the machine adjustments allow it.

Mechanical spray action can be improved by increasing the spray pressure.  This is accomplished by increasing motor speed of the spray pump.  Check for clogged spray arm orifices.  Check for inefficient spray arm rotation.

Over-loading can block mechanical spray action.