18/10/2025
SIX (6) WAYS TO CONTROL REVERSE OSMOSIS (RO) FEED WATER HARDNESS (SCALING)
Control feed water hardness for an RO system is vital in order to mitigate scaling on the membrane, which can reduce efficiency and damage the system.
Pre-treat your feed water to soften or reduce hardness before it enters the RO unit( best approach) using these 6 ways:
1.) Use of ion exchange softeners that help to replace calcium & magnesium ( the cause of hardness) with sodium or potassium ions.
2.) Addition of antiscaling dosing chemicals ( like phosphonates, polyacrylates, polyphosphates, and organic acids like citric acid) to feed water.
3.) Use of specialised membranes like nanofiltration or softening membrane systems.
4.) Proper monitoring that involves regular testing of hardness levels using hardness test kits (e.g The HI-3812 Water Hardness Total Test Kit) or continuous sensors to ensure pre-treatment systems work effectively and maintenance of hardness to be ideally below about 7 grains per gallon(120 ppm).
5.) Routine maintenance that entails maintenance & replacement of pre-treatment equipment ( softeners, filters, etc) as per manufacturer’s guidelines to ensure consistent hardness control.
6.) Feed water quality management that implies the controlling of other fouling factors like iron, manganese, chlorine, and turbidity, as these can worsen scaling and membrane fouling.
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