Ok, so you’ve invested in a hot tub – but tempting as it is to immediately sink into a delicious tub of warm water and feel the stresses of the day melt away, firstly you need to get a handle on your hot tub maintenance. Hot tub, spa, Jacuzzi – whatever you want to call it, there is a great deal of pleasure and relaxation to be had in owning one. But, it’s not all plain sailing, as with any pleasurable hobby, it requires a bit of work - mainly, a basic understanding of water chemistry and a simple schedule…