Litho printers use plate technology and reverse osmosis (RO) systems are used to produce pure RO water for rinsing the plate between uses. For further purity, deionised (DI) water is produced. This ensures consistency and quality for each print run. DI water is sometimes used to reduce the viscosity of some inks before printing and to clean equipment after printing. The high purity water is used to prevent any contaminants being added to the ink which could damage the final product and also to prevent contaminants such as hardness building up on printing equipment which again could damage/distort the final product.

DI water is also used to clean inkjet cartridges before re-filling. The DI water is warmed and then pulled through the cartridge using a vacuum. Typically, this water is bought in but some manufacturers produce their own to reduce costs.

Stages of Filtration & Water Treatment

Particle Removal

Prevents debris, scale flakes, dirt and particle build up in pipework, tanks, equipment and where present, premature blinding of filtration stages further along the cascade.

Particle Removal - Fileder Filter Systems

Chlorine and Organics Removal

Helps the taste and odour of the liquid and where present, protects RO membranes from chemical attack.

Chlorine and Organics Removal - Fileder Filter Systems

RO Water Production

Very pure water is produced using reverse osmosis membranes to separate the majority of salts and ions from the feed water and sending the salts and ions to waste or re-circulation.

RO Water Production - Fileder Filter Systems


The use of a mixed-bed resin of anion and cation, attracts all salts and ions, removing them from the water.

Deionising - Fileder Filter Systems

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