the amazonbasics premium replacement refrigerator water filters are certified by nsf international against nsf , and . nsf certified to reduce: estrone ≥ %; phenytoin ≥ %; ibuprofen ≥ %; naproxen ≥ %; bisphenol a ≥ %; nonyl phenol ≥ % nsf certified to reduce: lead ≥ %; benzene ≥ %; carbofuran ≥ %; cyst...