Question

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1. which of these is a limitation of a reverse osmosis (ro) system?

a. removes bacteria but not endotoxin
b. removes calcium and magensium
c. thin film composite membranes break down when exposed to chlorine and chloramines
d. produces purified water

Explanation:

A reverse osmosis (RO) system’s limitation relates to membrane vulnerability. Option A is incorrect because RO removes both bacteria and endotoxins. Option B describes a feature (softening water by removing minerals) not a limitation. Option D is a function, not a limitation. Option C is a limitation: thin film composite membranes (common in RO) degrade when exposed to chlorine/chloramines, requiring pre-treatment.

Answer:

C. Thin film composite membranes break down when exposed to chlorine and chloramines