The following table list the calcite/limestone suppliers that have been checked by DrinTec either by documentation or laboratory analysis, and can supply granulated calcite suitable for calcite filters.

• Calcite quality verification report (sample)

  Calcite-quality-verification-report-conclusions-sample.pdf – 6.61 MB

• Technical Letter: On the importance of calcite verification analysis

  On-the-importance-of-calcite-verification-analysis-S-7.2.pdf – 4.38 MB

The next table shows the quality of the limestone recommended for limestone contactors. In case of different quality, limestone pilot tests should be carried out to evaluate the material.

The presence of impurities with particle size >100 μm should be avoided to make sure there is no accumulation of impurities inside the reactor. On the other hand, the presence of too much fine dusty material <30 μm should be avoided as this tends to generates a constant turbidity of 1-2 NTU.

To guaranty good water quality, clean washed, air blown material and large particle material Ø 2-5 mm is preferred.