The most popular response I have seen is to arrange to have someone add bleach for you. Maybe if they do it every 3 days, (and you chlorinate before you go) two visits should hold you until you get back.
The second option is tri-chlor pucks which will raise your CYA some and lower your pH. If you do this, it might be a good idea to raise the pH before you add the pucks as pH below 6.8 can cause liner damage.
There is a third option of cal-hypo (HTH Duration or Poolife Active Cleaning) capsules but you need to find the 68% concentration and even at that it seems like these don't last more than a couple of days.
Peter
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