Generally these systems are used in the pharmaceutical and biomedical sector for the purification of water and aqueous solutions from disolved salts, bacteria, viruses, algae, mold, fungi and spores.
These devices allow to obtain small amounts of water with various degrees of purity:
Ultrapure water 18.2 MΩ
HPLC grade water >10 MΩ
Deionized water 1-10 MΩ
Each of these degrees of purity has a lower amount of impurities than water treated with a simple reverse osmosis