Adjective
Tending to leave an incrustation on a boiler or other container when the containing water evaporates.
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It is the practice at the Columbus plant to leave between 25 and 40 parts per million incrustant hardness in the water.
More examples (1)
For the sessile fauna it was found that the visible first settlers were present after one week and were the incrustant forms of one species of foraminifera and one species of a red calcareous algae.
Split-lime softened water after blending is usually incrustant and difficult to filter unless fully recarbonated or acid treated.
Noun
Any substance that is dissolved in water which forms an incrustation when the water evaporates.
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More examples (3)
The total incrustants in the water, expressed in terms of calcium carbonate, are clearly the sum of their component bases, calcium and magnesium, expressed in terms of calcium carbonate.
Aluminum also is an incrustant present in most waters in quantities so small that it is not necessary to consider it; but when too much aluminum sulphate, a substance frequently used as a coagulant in filtering water, is added in the process of filtering, the excess passes through the filter and may cause trouble in the boiler, where it hydrolyzes, forming free sulphuric acid.
Solid particles of incrustant can be removed along with any fine sediments that may have entered the zone immediately around the screen after the well was placed in service.