For an iodine-based (iodophor) sanitizer, which concentration range is generally correct?

Explanation

Iodine sanitizers, or iodophors, are effective at roughly 12.5 to 25 ppm within the manufacturer's specified temperature and pH range, with at least 30 seconds of contact. The other three sit outside that window: 50 to 100 ppm is the chlorine range and about 200 ppm is the usual quat range, so neither applies to iodine, and 0.25 to 5.0 ppm is drinking-water territory, far under the 12.5 ppm floor and too weak to sanitize a surface. Check the product label and verify with an iodine test kit, because chlorine strips do not read iodine.