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I used a RO for 14 years before adding a water softener about 18 months ago. My tap water TDS is over 800 and the hardness is in the neighborhood of 20+ grains or about 350 mg/L (ppm) (mg/L or ppm divided by 17.1 equals grains per gallon hardness). Membranes lasted 3+ years no problem. The secret is keep the waste ratio at the recommended 4:1 or slightly higher as high as 6:1. By keeping the membrane well flushed it lasts just fine. Its when people try to reduce the waste that they shorten the membranes life.
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