the hydro-automatic gravity filters deferum for water purification, with floating filtering media. intensive degassing of water, reagent-free increase ph. effectiveness of deferum & demagnum system in removal of high iron & manganese in groundwater source. the low costs of non-chemical cleaning in deferum. floating filters with backwash without operators, valves, electronics, electricity, air. a very small amount of water is required for self-backwash. very low maintenance. sale and transfer know-how. supply of container units deferum (in 20 or 40-foot containers) for cleaning or post-cleaning of artesian water for supply to a cottage, town, village, enterprise, apartment building. deferum-05 operates in a cottage, in a hotel, in a settlement, in an apartment building, in an enterprise, as well as with other owners of artesian bore and water intakes to clean the source water from iron, manganese, hydrogen sulphide, ammonia, fluorine, boron, strontium, etc. concentrations. boot (bilding, ownership, operation, transfer), financing, insurance, manufacturing, supply, construction, start-up, sale of water, management, free transfer of the water treatment plant to the municipality (after the parties fulfill the contract)