Using an inductor for low-pass filter

I got a quote for a 20kHz low pass filter: $475. So that settles it,
I'm going to make my own. I really just want something basic and
simple so a series inductor circuit (http://www.allaboutcircuits.com/
vol_2/chpt_8/2.html) would seem to be fine. Now I am not sure what
amount of Henrys are required to get a low pass filter of 20 kHz or
thereabouts. Also, what wire should I buy and how many turns are
needed. Sorry I am such a newbie, any help appreciated!

.

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