Thanks for the advice. K-2600 is on order, and I got the HTH 6-way kit for now. Using HTH kit, CYA is 60. TA is 130. pH is 7.5. So all of that is good or pretty close.

Using bleach, I've been keeping chlorine at the highest reading the HTH kit gives (5-10). Recommended shock level from the best guess table says 10, so I'm in the ballpark, but won't know for sure until the better kit arrives. At any rate, there's no new algae growth.

Once I'm certain the algae is under control, the next step is to determine if the generator is any good. The cell is probably as old as the house, so seven years.

Regards,
hikernut