i did this for a number of years, paid for the montag on its first year because urea was so much cheaper. ran it for i think 3 or 4 years. have ran 32 the past couple because money got too close. 

local coop i was buying through would add in a floor dry like substance.... cant remember name. did work fine. vr was nice because row to row was fine at 1-150 lbs n compared to orifaces. 

logistics of filling where tough, and to keep coop tender in the loop. 

still run the same bar, has 2996 yetters with closing wheels we built. we ran every row because of the slower release/breakdown of the urea. 

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