Ultrasol® micro FeD12. It is a product developed for use in acidic to neutral pH soils to prevent or correct iron deficiencies. It is an excellent product for use in hydroponic systems. It can be applied through fertigation, "This product is within the category of plant nutrients and is not classified as toxic according to NMX-R-019-SCIFI-2011. Read the safety data sheet carefully before using this product."