The chubber float is ideal for fast flowing river fishing, it is often used with big baits for Chub and Barbel. With most of the shot being close to the hook the bait can be presented either on or close to the river bed. Generally medium to heavy lines should be used to prevent the possibility of constant break offs in the event that the river is snaggy.
Fish the main line straight through to the hook and if you find that big fish are present then step up the line size to suit. In clear water use baits like worm maggot bread or meat, and in coloured water the smellier baits like cheese or flavoured meats tend to work better.