Zero FC Pool is crystal clear

[Hurricane1938]

Hi,
As you know this is my first post. I've been a pool owner for 18 years and never had a problem like this.

Background: This past winter was uncommonly warm. With the porous Loop-Loc cover, I'm accustomed to a green pool when opening it, but this year it looked like pea soup and smelled like a sewer. Initial CYA reading was 0.

After a lot of work I've gotten it clear and added ~24oz of Polyquat 60%.

Now, the pool specs:
27,000 gallon, 18X36 inground vinyl pool, DE filter, Hayward off-line chlorinator, heated with natural gas.

Pool water is ~80F and clear. Taylor K-2600 readings:
FC=0; CC=0.8; pH=7.4; Alkalinity=110; Hardness=170; CYA=75

Circulator is running 24hrs. Chlorinator is set to Full with 3" tabs.

I have been adding ~2.8 gal of 6% plain bleach each evening, but by morning my FC=0.

Even with the Polyquat, if I'm away for a few days, I will sometimes see a small amount of green algae, until I dump several gallons of bleach and brush the pool.

I’m grateful that the pool is clear and swimmable, but what should I do now.
Thank you!

Peter