Existing calcium and carbonate buildup will be removed very rapidly from systems, however iron, being a mineral difficult to dissolve in water, will take considerable time to be removed. Initial chemical cleaning may be a good option to avoid unreasonable expectations of the CALCLEAR in systems where the blockages are already severe. This is best discussed with our technical staff who have a wealth of experience with treating iron and iron bacteria blockages. As everyones’ experience has shown, water is very complex and a variation from site to site can be expected in results, time frames and outcomes.