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Ultramax is a concentrated insecticide from Pharmachem, supplied in 100ml and 250ml. Being a concentrate it is dosed at a much lower rate than the brand's ready-to-use products — see Swat and Shield if you want something you can apply straight from the bottle.
Choosing a size — the 250ml is noticeably cheaper per millilitre and is the sensible buy if you treat through a full fly season.
Read the label before use: it carries the registered species, dilution rate, withholding periods and safety directions, and those must be followed exactly for a concentrate.