Do you really need to shock your spa every week or so?

I was told to do this when I first got my spa - that was about 14 years ago. Since then I have reduced the frequency of the shocks without any ill effects. Not as an explicit strategy but out of laziness. Since I went to a drop-in SWCG two years ago my spa it is clearer than ever. My spa isn't used a lot - probably 1-2 bathers per week (usually me).

Do you really need to shock a spa every week or so?

FYI - My spa is a Jacuzzi and is standalone. It is always covered when not in use with...

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