... Tripolyphosphate Used as main auxiliary of synthetic wash, soap synergistic agent, water softener, etc. Used as ... main auxiliary of synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, ... poultry process.STPP Used in detergent, synergist for soap; water softener; tanning agent for leather making, ... or densifier in foodstuff industry. Super Sodium Tripolyphosphate