Pretreatment is necessary for all systems which are generally designed to eliminate chlorine, suspended solids, water hardness, and other oxidizers. Calcium and magnesium deposits can plug the membrane. To keep the solids in suspension chemicals or water softeners are added to the water. To remove the hard ions a water softener is used. Reverse osmosis systems from the RO system controller manufacturer require regular maintenance and replacement of various components so that it can perform well. Regularly, it is necessary to replace pre-filters and post-filters. On the water quality, the length of time between changing pre-filters will depend, especially the concentration of solids. When post-filters will be replaced is determined by the contaminant concentration, membrane rejection percentages, and efficiency of activated carbon removal.
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