I merged your two threads.

Loosing 1.5 gallons of bleach in a green pool overnight is pretty much par for the course. On your pool that's only about 7.5 ppm. Algae infested pools can easily consume 10 or 20x what a clean pool would.

Assuming your pool is about 13,000 gallons, (12 x 12 x 3.14 x 3.75 x 7.48)

Test your stabilizer,too.

And, if you see this before you go to bed, add about 4 gallons of bleach tonight.

PoolDoc