Air Injection two tank venturi valve system HELP

https://terrylove.com/forums/showthread.php?39623-Help-with-well-system&p=282819
please see the above link to the thread with pictures that explain my system.
I have this type of system and I am trying to figure out how to service it. What kind of media to add, etc.

I can't find a plumber that knows the system to work on it or any instructions online. please help, Im desperate...

Thanks

from the linked thread...

1) What & how much media should I be putting in the tank with the Fleck control valve on it?
2) Is there a web page that gives a thourough matanance plan of this system?
3) There has to be some kind of maintenance or media replacement needed for the In/Out tank. Is there?
4) Will properly installing a CSV cause any problems with this system?

I found this... http://www.neotecwater.com/pdf/iron_air_manual.pdf

not enough info! adding media and type? cleaning out the tanks?

this ones a little better...http://www.aquat.com/images/ATS_Air_Injection.pdf

Still not enough info.