Why a Softener and an RO Unit Perform Different Jobs
A softener exchanges hardness ions; an RO membrane separates water into permeate and concentrate while rejecting dissolved constituents to a degree that depends on the membrane and conditions. Softening is not equivalent to desalination, and neither operation alone establishes every finished-water requirement.

Assign the pretreatment duty
Use hardness, alkalinity and other feed-water results to evaluate scaling control. A softener may form part of that design, but its service capacity and regeneration schedule must fit the feed flow. Check hardness downstream rather than assuming regeneration restored performance.
Check the RO separately
Measure feed, permeate and concentrate flows and relevant water-quality indicators. Evaluate performance changes against operating conditions. Increasing pressure is not a substitute for diagnosing exhausted pretreatment or membrane fouling.
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