When I initially had the pool installed we tried to use plain bleach to chlorinate, but it seemed like no matter how much we added (in some cases multiple gallons), it was never enough and the pool eventually had some sort of algae or bacteria floating in it. Switching to Chlor-Brite took care of it and as kept it clean, until now.

Also, draining and refilling every six months isn't an option, unfortunately, as heating 3000 gallons to 95 degrees using the stupid electric heater can take 5-7 days of 24/7 use, resulting in electric bills over $1k for that month.

Thanks for the in-depth reply. I'll have to think about some stuff.