Water Tubes will keep the cover from sinking into the inground swimming pool. Tubes should ideally be touching each other end to end (around the pool). They will not split, rip, puncture or break. Installation is easy! Simply fill to 50% capacity (to allow for expansion of ice) with a garden hose and close the leak-proof valve.
Note, if you live where the temperature dips below freezing, leave a little space to expand for ice. The heavy duty water tubes are a much higher quality than the standard ones.