Just like pools, spas need balance.
In spa-speak, balancing refers to preparing the water so that
the protective products you add later will work effectively.
Why is this important?
Firstly, if your protective products aren't working effectively,
your spa can be over-run by nasty micro-organisms. Secondly,
unbalanced water may be corrosive, resulting in damage to the
equipment in your spa.
Also, a balanced spa should be in harmony with the human body
(sharing the same pH level), which makes the water more
pleasant. Huzzah!