High Nitrate Help

[Pablos]

How is the quickest way to bring down nitrates?

 

[WILDER]

Water changes, but need more info.
Size of tank in gallons or litres, how many fish and which type.
Make of filter, how often do you do a gravel vac and water change.
And what is your tap nitrate reading, and what your present nitrate reading how high is it.