Yes, I can get a floater - but won't that just move the problem to the PVC cover ? The cover floats on the surface of the water.How long pucks last is based on water flow and temperature.
Can you get a floater for the pucks? Putting in the skimmer is not a good idea as they are very acidic.
I have read about issues regarding putting pucks in a skimmer, the guy that built the pool told about stories where the pipes below the skimmer had been 'eaten away'. So clearly it is not a great idea - but for a couple of weeks it might be better than risking the cover ?