Yeah, and my understanding is that it's due to the possibility of corrosion from the presence of salt. I'm buying a good quality galvanized pool, so that should minimize most of the problems, but regardless this pool is just a temporary solution at the new house that I'm buying and moving into the first of July. I'll eventually be going in-ground, but that will likely be a year or two down the road. Thus my question, in trying to think ahead about equipment that I could purchase for this temporary pool that would also be able to be used on my future in-ground.