Hi, I am the current owner and caretaker of my family's pool that my grandfather had built back in the early 1970's. Its an old A&S inground gunite pool, around 30K gallons. All of the original filtration equipment has been replaced over its many years and it was re-plastered ten years ago. I have been practicing the BBB method for several years now, but there still seems to be a lot I still need to learn. Also need to unlearn a few bad habits such as rushing my pool opening in the spring.