Q: What's the difference between cationic and anionic polymer?

Cationic polymers (+ charge) target negatively charged biosolids — standard for dewatering activated sludge. Anionic polymers help with metal hydroxides and primary sludge.

Question 1

What is the difference between neat and active polymer?

Accepted Answer

Neat is the as-shipped product (40% active is typical for emulsion polymers). Active is the actual polymer chain content. All performance specs are on an active basis.

Question 2

Why do polymers need to be aged?

Accepted Answer

Emulsion polymers must be inverted (oil drop opens) and the chains hydrated for 30–60 minutes before dosing. Skipping aging cuts active yield by 30–50%.

Question 3

How do I find optimum polymer dose?

Accepted Answer

Run a jar test or capillary suction time (CST) test at increasing doses; pick the lowest dose giving target CST (<15 s) or cake solids.

Question 4

What's the difference between cationic and anionic polymer?

Accepted Answer

Cationic polymers (+ charge) target negatively charged biosolids — standard for dewatering activated sludge. Anionic polymers help with metal hydroxides and primary sludge.

Polymer Dose Calculator – Active vs Neat