Information about pool

27,000 gallon
Sand Filter

So far pool was opened and looked pretty good, clear, minor debris in bottom that was vacummed up, added bleach to get clorine levels to a good amout

Check all chem levels using test kit and everything was fine.

Then I went out of town for a week and with the increase in temps the pool has turned green

Had a timer on pump to turn on for 4 hours a day.

Now status

FC shows level in the 20ppm range
CYA close to 100
PH is 7.2

Added bleach on Monday afternoon to bring level up to 20ppm range, 6 gallons total of 6% bleach from Wal Mart

Been brushing pool walls and bottom and backwashing several times a day.

Pump has been running 24 hours.

Green color has moved a little from a real dark green to a light shade of green

What should I do now?

Thanks