Dear Tirellil. What type of ...

Dear Tirellil.

What type of Desalination technology is planned:

If Thermal, no particular issues are there for filtration. Even the fine filtration by deep sand bed is not necessary and eventually one self-washing filters (about 1 - 1,5 mm mesh) is quite enough-

If RO, the sand filtration is actually crucial in the pre-treatment sequence, with two main issues to be considered:

a) Degree of fine filtration: I suggest a typical sand particle size meshed in the range of 0,7 to 1 mm

b) Sand not releasing silica into the filtered water, because silica is very difficult to be reduced by RO. Quartzite sand is therefore to be preferred because of the lowest degree of impurities (impurities cause the release of silica)