F statistic values more than 1000 (sample like 2000 and 5000 )

I am studying the water parameters from three different groups.

I performed ANOVA and found for few parameters F value was way high to report.
I understand high value explains variance very well between groups. But can i report such values to scientific society.
The parameters concerned here like BOD in a group were 0 for three replicates where for other 2 groups the value was very high like mean 50 and 10 respectively.

Kindly explain reasons for such behavior and interpretation of results.