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Fig. 5. SEM-photograph of the amorphous scaling in the membrane of the scaling monitor (magnitude 1000 X). Table 4 MTC-decrease of the membrane elements from the third stage in the pilot plant MTC-decrease, % Element 1 Element 2 Element 3 Element 4 T he scaling monitor demonstrated to be able t o detect scaling before it took place in the last s tage of a pilot plant. I n order to verify whether this conclusion has g eneral validity the method will be tested in c ombination with pilot- and full-scale plants fed w ith different types of water. If so and it is e xpected than the scaling monitor will be a s trong tool in: - O ptimising the operating conditions o f the f ull-scale plant, i.e. conversion and the require d anti-scalant/acid dose; - I dentifying the nature of scaling without the n eed to interrupt the operation of the fulls cale plant; - O ptimising the chemical cleaning procedure a nd frequency.