Reverse osmosis (RO) membrane manufacturers often are asked how long membranes will last in service. The responses to that question may vary a little, but essentially the answer is, "It depends." An equally good response is, "How long do you want them to last?" The fact is, RO membranes can last a long time. Some membrane installations have run for 10 to 15 years on the original set of elements, while other installations operate their membranes for only six months before they need a new set. The differences between these two types of operations fall into two categories: differences in pretreatment and differences in operating discipline.
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