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If you get a PTO driven pump, make sure you clean it well after using it and the manual for mine recommended putting antifreeze mixture in it when stored as it not only keeps it from freezing, but also lubricates the pump. The chemicals are pretty caustic.
As others mentioned, I use 2,4,d for the broadleaf weed control. If you want to save some money, you can ususally get it at the local extension office. It is also available at places like tractor supply for a fairly reasonable rate. If you buy chemicals at the store, make sure you look at the amount of active ingrediant. It can vary greatly which affects how much it really costs. I have been buying the glyphosate product at Tractor supply in 2.5 gallon quantity and a 41% strength. That goes a long way for my usage. Gordon's Pronto Big N' Tuf 41% Glyphosate Weed & Grass Killer, 2-1/2 gal. - 4201103 | Tractor Supply Company
Good info to know, thanks for this! Antifreeze makes sense when you think on it... Funny you mention the TS stuff, was there yesterday pricing some of what you describe!