There are very good  scale ...

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There are very good  scale inhibitor for calcium carbonate and/or sulfate (for example: Gengard line from GE Water) . The silica cause problem in the cold section of the system ( cooling tower, fill of tower), but silicate cause some problems in the hot section of the system ( heat exchange) . To silicate, we need to respect the solubility limit of magnesium silicate and magnesium/calcium silicate. There is system where is possible to simulate this situation in the cooling water system.