In the production of pulp wash, the cells which have been separated out by the finisher are treated in a multi-stage counter-current washing system.

With the aid of scroll mixers and finishers, it is possible to extract up to 90% of the valuable juice components such as fructose, fruit acids, minerals, carotins etc., from the cells. The pulp wash which is obtained in this process has a Brix content of between 4 and 5° and still contains a high proportion of trub particles. These can be separated out with the aid of clarifiers. The pre-clarified product is concentrated to 60°Brix in an evaporator.

Pulp wash can be marketed as a product in its own right. It is also usual and allowed in some markets to mix orange juice with the pulp wash before the concentration process. The maximum amount of pulp wash which may be blended with the first-class juice is governed by the statutes and standards in each individual country.

The capacities of pulp wash clarification are roughly equivalent to the capacity of normal citrus juice clarification. This is true if the pulp content does not exceed 10 to 12% (vol.) upstream of the centrifuge.

Figure below details the process for the production of pulp wash