When preparing Polyacrylamide (PAM) solution, you may notice small gel-like lumps that do not dissolve completely. These are commonly called “fish eyes.”

They can reduce flocculation performance and affect wastewater treatment efficiency.

Main Causes of PAM Fish Eyes

🔹 Adding PAM too quickly
PAM particles absorb water rapidly and form a gel layer, preventing complete dissolution.

🔹 Insufficient mixing
Poor agitation causes PAM particles to stick together and create lumps.

🔹 Incorrect concentration
A solution that is too concentrated may dissolve slowly and unevenly.

🔹 Wrong PAM selection
Different wastewater requires different PAM types, such as anionic, cationic, or nonionic PAM.

How to Avoid PAM Fish Eyes

✅ Add PAM slowly and evenly
✅ Keep proper stirring during preparation
✅ Allow enough dissolution time
✅ Choose the right PAM type for your application

Proper PAM preparation helps achieve better flocculation, solid-liquid separation, and sludge dewatering performance.

Need the right PAM solution for your wastewater treatment? Contact us.