HQ or MQ: choosing a Sunfloc grade
The difference between the two Sunfloc grade families, and which one fits your plant.
HQ grades
Full specification: molecular weight, charge density, total solids, residual acrylamide, insolubles, particle size, viscosity and a recommended working concentration. 25 kg bags.
MQ grades
Specified on core parameters: bulk density, pH and maximum use concentration. 10 kg bags.
Choose HQ when
You run a regular plant, need a full specification for an approval file or tender, or want the grade with the most documented properties.
Choose MQ when
You run a smaller plant, want a trial quantity, or prefer a lighter bag to handle on site.
Charge first, family second
Pick anionic or cationic for your stream first, then HQ or MQ. The grade selector does both.
Related
Polyelectrolyte dosing guide
Starting doses, solution strength and how to work out kilograms per day.
Read →Reading the two specification sheets
HQ and MQ are not simply strong and weak versions of one product. HQ is supplied as 25 kg bags with a very high molecular weight and a medium charge; MQ is a 10 kg bag grade with a stated bulk density of 0.72–0.78 g/cc. Read both specification sheets side by side before you choose.
A higher molecular weight builds larger, stronger flocs and suits clarifiers and thickeners where there is time to settle. A lower weight dissolves faster and suits smaller plants and quick make-up. The only way to know for your water is to jar-test both on the same sample.
Record settling rate, overflow clarity and the dose used for each, and compare the cost per cubic metre treated, not the price per kilogram.
Sources: ASTM D2035-19, Coagulation-Flocculation Jar Test of Water.
Not sure which grade suits your water?
Send us a one-litre sample or describe your process. We test it in our lab free of charge and recommend a grade and starting dose, and quote within 1 business hour.