markm75 writes:

Can anyone comment on how long to run the pump/filter? IE: On 900
gallons is 8 hours a day enough?

Should be plenty.

Unlike some of the other posters I DON'T recommend going
to a store and getting a water test.
Invariably they will find 3 things wrong with your water
and recommend a 100 bucks worth of chemicals to fix it.

With your small pool that makes no sense at all.

Monitor the chlorine level and PH.
You should be fine.
Enjoy.