Best Answer Gnarl, 12 February 2019 - 10:16 AM
Metal detection capapability is, amongst other factors, mainly influenced by detector aperture size.
Means your supplier is most likely working with worse values than you would typically desire for consumer sized products.
Request their current standards, if they exceed Ferrous: 1,5mm NFe: 2,0mm and Stainless: 3,0mm I would suggest to either
check while filling or control the single filled pouches.