chemical · input
Zeolite 4A (laundry builder)
Synthetic aluminosilicate; replaced sodium tripolyphosphate (STPP) as the water-softening builder in laundry detergents after state phosphate bans in 1970s-80s. Prevents mineral interference with surfactants.
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1 essential American goods rely on zeolite 4a (laundry builder) somewhere upstream in their supply chain.