Bio-Stromatech product is an object of the present invention a method for increasing the concentration of calcium carbonate in a geomaterial comprising the following steps. Indigenous ureolytic bacteria that are suitable for the method of the invention are non-pathogenic bacteria which constitutively express urease so that urease is expressed regardless of ammonia or nitrogen compound concentration. Such organisms include the following bacteria: Sporosarcina pasteurii and Sporosarcina ureae. Other microorganisms suitable for the method of the invention are non-pathogenic bacteria in which urease is expressed only in the presence of urea.
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