FerriTabs for Swimming Pools: How to remove iron from pool water May 15, 2019May 15, 2019 Ask the Pool Guy This is one of our pools where there is some iron in the source water. The pH level drifted up as a result of the chlorine generator producing chlorine and adding a constant increase in pH as well. The pool was treated by lowering the pH and alkalinity, as well as adding a metal removing product, FerriTabs to the water.