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A number of watercycle residuals – e.g., iron, lime, and humic and fulvic acids – can be used as (additives) in animal feed. Although the residual streams are generated in the unimpeachable process of producing drinking water, producers and dealers – principally with hygiene in mind – habitually demonstrate the streams’ safety by means of the GMP+ certificate.

GMP+ (Good Manufacturing Practice) was established as a means of assuring the safety of animal feed in every element of the chain. The focus is on the hygiene in the production phase. The certificate is internationally recognised, and proves that the ingredient supplied by the certificate holder meets regulatory requirements and, in some instances, even meets branch requirements that exceed the regulatory ones.