Your pool is in the land of "PoolDoc & Chem_Geek & others don't know what's going on with it". Consequently, I'm being tentative.
That said, at summer time temps, pools do NOT do well with a week's inattention.
This is one of the major benefits of salt systems: if you get the water level and salt level up, and get everything running well before you leave, you can be pretty confident that the salt system feed will 'keep' it for a week.
There are other methods:
+ install a tablet feeder, like a Rainbow 320
+ run your CYA up to 100 ppm, and your chlorine up to 20 ppm
+ have someone check it every other day, and pour 5 - 10 ppm worth of bleach in.
+ clean the pool up thoroughly, and then drop chlorine levels and add an overdose of polyquat.
+ add a heavy dose of a copper algicide.
You could do any of those. They will probably work. But given your pool's recent history, I'm not as confident as I might be otherwise.
I don't really think adding the borax and polyquat is all that hard, however. You've had to do worse, in dealing with this pool, and adding the borax will leave you with a semi-permanent algae inhibitor.
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