Do *NOT* add conditioner. At summer's end, odds are your CYA (conditioner, stabilizer) is already too HIGH.

Instead. add your 2 gallons of 12% bleach, and then go to Walmart (or other big box) and purchase 15 gallons of PLAIN 8.25% store brand bleach. The store bleach is much more likely to be full 8.25%, than the pool bleach is to be 12%. We can check that, later.

Begin adding 3 gallons of 8.25% bleach *late* each evening. Continue dosing like this for 3 days after no visible algae remains.

Use your K2006 to accurately test your CYA level; report that, along with a full set of other results, here.

-- I'll probably spin this off into it's on separate thread after your next post --