Pretreatment Systems Source: Aquatech International Corporation Aquatech's pretreatment solutions include clarification, softening, filtration (both pressure & gravity), chemical feed systems and sludge handling. Click Here To Download: Aquatech's pretreatment solutions include clarification, softening, filtration (both pressure & gravity), chemical feed systems and sludge handling. Aquatech's pretreatment solutions include clarification, softening, filtration (both pressure & gravity), chemical feed systems and sludge handling. Almost all raw water sources: surface, ground, municipal, sea or others, require pre-treatment before the water can be further treated in most pure water treatment systems. Pretreatment systems can include various types of equipment to remove color, suspended solids, dissolved solids and other contaminants harmful to the pure water treatment system and the industrial process of our clients. Our Technologies Include: