Our lineup includes specialty cartridges for iron and manganese, fluoride, arsenic, deionization of minerals, phosphate crystal for reduction of scale, and nitrates. Each cartridge is limited to the specific contaminant it is rated for. Flow will vary as to the effectiveness in these standard size specialty cartridges. We are happy to add to our lineup of specialty cartridges, the Metal Trap filter from HydroPure. This iron and other metals rated cartridge has been very effective in the field at removing tough iron situations at a better flow and longer life than other options. They cost more but extended life and effectiveness should make it a worthwhile option for those facing heavy iron situations.