FIELD: depression of microorganisms and biological fouling in papermaking. SUBSTANCE: method involves supplying orthophthalic aldehyde in water systems susceptible bacterial contamination. Orthophthalic aldehyde is introduced in an amount of 0.5-1000 parts per million, individually or in conjunction with glutaraldehyde or formaldehyde. EFFECT: wider operational capabilities and increased efficiency in depressing microorganisms. 3 cl, 5 tbl
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