The main applications of organic polyelectrolytes in potable water production are in coagulation and flocculation, and in the dewatering of treatment plant sludges. The water production processes are usually followed by sedimentation and filtration, although with only slightly contaminated waters the sedimentation step may be omitted. The sludges obtained from the various separation processes have very high water contents and must be further concentrated to minimize transportation costs; polymers have a role in this sludge conditioning. Polymers have been utilized in coagulation/flocculation processes for water purification for at least four decades. For many years cationic polyacrylamide flocculants have been used in the sludge dewatering process. The water treatment chemicals including flocculants and coagulants especially designed for the solid‒liquid separation processes in the industrial and municipal wastewater treatment sector. The structure of the cationic polymer ZETAG 9014 under the influence of changes in pH of the medium was studied in an aqueous solution. Cationic polymer type ZETAG 9014 is structured under the influence of pH changes. When reducing the pH of the medium, there is a clear trend, in which the average particle size reduces and the size distribution narrows. Conversely, at higher pH values (alkaline region), the average particle diameter broadens the PSD. It is important to note that the type of pH modifying agent (in particular, acid) can also affect the polymer structuring process. The chemical agents used to modify the pH of the suspension (medium and polymer) were NaOH, KOH, Ca(OH)2 and HN4OH.