तयोस्तापनमवध्वंसनं वा शुद्धिः ॥ कZ_०२.१४.३६ ॥
tayos tāpanam avadhvaṃsanaṃ vā śuddhiḥ
For those adulterants, purification consists of heating (to separate) or complete destruction/removal.
It enables proportional enforcement: salvage by heating when feasible, or mandate complete removal/destruction when the impurity cannot be safely separated.