The tubing comes from a roll, so it will have some curl to it. Sometimes that can be a problem when trying to get it to reach the bottom of a container of liquid chlorine. There are a few things you can do.
First, store the tubing straightened out by sliding it into a length of 3/4 inch PVC that is longer than the tubing. This will remove most of the curl, but not all of it.
Second, cut a piece of 3/4 rigid PVC pipe that is longer than the depth of the jug and insert the PVC into the container so that it sticks out a few inches. Then, when you insert the tubing into jug, just slide it into the PVC pipe all of the way to the bottom.
Note: Liquid chlorine can be dangerous. Please be careful when handling.