Pool located in Southern NH. 30 foot round, 52 inch wall Esther Williams pool that I purchased around 2002. This mfg is no longer in business and when I needed to replace the liner I looked here for info. I filter the water with a DF filter and I use chlorine (tabs and liquid bleach or powder shock) for chemistry. In replacing the liner, I am wondering the pros and cons of adding a foam cove. Is the Cove beneficial or should I just stick to the sand cove method?