I CAN REMEMBER WHEN I WAS A LITTLE GIRL .....MY MOM USED TO FILL THE HOT WATER BOTTLE AND LIE IT FLAT TO GET THE STEAM OUT SHE WOULD SAY !!!
BUT NEVER KNEW ABOUT PUTTING SALT TO KEEP IT WARM LONGER ..... I GUESS THERE IS NO HOT WATER BOTTLES NOW ..THIS DAY AND AGE ...LOL... BUT I STILL HAVE ONE UP TO THE CABIN .....