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Colloidal impurity accumulation is a stubborn wet-end hazard that causes continuous quality fluctuation in papermaking production. Pulp and white water contain a large amount of tiny dissolved colloids, including degraded wood resin, pectin, adhesive residues and microbial colloidal metabolites. These ultra-fine colloidal substances cannot be removed by conventional screening and flotation equipment. They continuously adhere to fiber surfaces, block fiber pores, weaken auxiliary agent adsorption, and cause unstable sizing, uneven strength and periodic sticky paper defects. In recycled pulp production, colloidal impurities are more prominent, leading to frequent mesh and felt blockage, reduced water filtration speed and increased cleaning frequency. Traditional impurity removal agents only target large particles and have poor trapping effect on dissolved colloids, resulting in long-term hidden wet-end hazards. Shandong Ludao Energy Technology Co., Ltd. develops targeted pulp colloidal impurity removal solutions. By capturing and agglomerating micro colloidal substances and promoting precipitation and separation, we thoroughly eliminate colloid interference in wet-end system. The solution purifies pulp internal environment, restores fiber activity, stabilizes auxiliary agent efficacy, reduces sticky paper defects and equipment fouling, and ensures long-term stable operation of papermaking wet-end system.