Immersion in a polyphosphate solution is one of the most common treatments given to fish and crustacean shellfish before freezing to prevent excessive drip loss on thawing. However, this treatment can also be used to bind in excessive moisture, as Herby Neubacher reports
It is important to stress that the use of polyphosphates is not prohibited; it is the degree to which they are sometimes used that causes problems. When a low price will secure a big contract, the temptation is to reduce the cost of the raw material by first of all making sure that there is no drip loss, and in extreme cases by binding in added water.
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