Don't wax.
The most important part is water balance. If you test your tap water, you will get a good idea what you are starting with. In my area we have high pH and TA. So in the case of my 500 gallon tub, I have to add close to 6 ounces of 'Spa Down' within the first day or two. I usually add three ounces as I fill, and three more the next morning.
In your case, you will want to figure out the approximate amount of up or down which you will need. Then you will have to find a way to mix it into the water. You could add it as you fill and let the water stir it in as the tub fills, or you could mix it into bucket of warm water (so it dissolves completely) and then add it to the tub in liquid form.
Once the tub has had overnight to settle down to a stable pH and TA, then you can add some chlorine by dissolving it in buckets and adding it to the tub.
OR -
You could just wait until the day the electrician shows up.
8-)