The dangerous pond

A broken bridge, and a dangerous pond with a little platform bobbing in it, split the grasslands in two. The platform sinks too low to stand on.
Nudge 1Where to look
Things float better in salty water.
Nudge 2A stronger push
The salt is on Carber Bay's far side: the pond's west bank is reached from there.
What you needOther problems to solve first
Solve these first (each opens its own page, no answers on the way):
Show the solutionThe whole answer, with a video
Bring the large bag of salt (Carber Bay, far right) to the pond's west bank and drop it at the edge by the platform: Dizzy throws it onto the platform, which rises and bobs high enough to jump onto. Cross on it to the east bank.