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STPP Replacement APSM Active Poly Sodium Metasilicate for Detergent Powder. STPP Replacement: Effective low-phosphorus alternative to STPP for detergent powder formulation. Surfactant Compatibility: Good compatibility with non-ionic surfactants and self-consistent stain removal. Strong Acid Resistance: Superior acid resistance compared to Zeolite and STPP, maintaining stability. Environmental Friendly: Phosphorus-free builder that reduces environmental impact in detergent use. Long Shelf Life: Standard 24 months shelf life; actual life is longer if stored properly.