I just bought a 55 gal boom sprayer from TSC. They neglected to tell me that I had to buy the pump separately. I got a Hypro 6500 cast iron. When I got home the manual said not to use roundup or liquid fertilizers with the cast iron, but it does not explain why. Do I have to go back AGAIN and spend extra money for another pump?
Roller pump
- Thread starter loopyl
- Start date
chrisjbell
Platinum Member
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Roundup and most fertilizers react with the iron (or steel). The impellers on pumps that are designed for those chemicals are plastic (rubber). You'd probably be OK if you were diligent about cleaining the pump out real good after using chemicals, but to be safe you might want to return the pump you got and get one rated for chemical spraying.
GEB
Gold Member
What I do is make sure to clean the tank and pump after each use.
Then add some oil to the pump to keep it from rusting.
A few ounces of oil and a few good spins has worked for me so far...
Gene
Then add some oil to the pump to keep it from rusting.
A few ounces of oil and a few good spins has worked for me so far...
Gene
Farmwithjunk
Super Member
loopyl said:
Round-Up (glyphosate) is a salt-based product. Enough said. Fertilizers (especially those high in nitrogen) are extremely corrosive. You CAN spray round-up with a cast pump, but IMMEDIATELY after you're finished, wash the pump with water and a product like Neutra-Sol (TSC sells a nuetralizer) then fill the pump with diesel fuel or a lightweight oil until next use. Corrosion will FINALLY get the pump anyway, but you can extend the life for years if you keep the pump washed out and oiled. I've got a cast pump (Hypro) that's been used exclusively with glyphosate or 2,4-D. It's about 15 years old, and still pumping fine.
lawn_king
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Roundup can explode if mixed and used in a steele tank!
Bird
Epic Contributor
I agree with the others; no problem as long as you thoroughly clean the pump after each use AND apply a lubricant. The only difference between what has been recommended and what I did was that I filled my pump after each use with regular old Prestone antifreeze instead of oil. When I wanted to use the pump, I poured out the antifreeze, used and cleaned the pump and put the antifreeze back in it. Even a pump thoroughly cleaned with water will rust and seize up if left with just air in it. You can then take it apart pretty easily though and clean it out. I had a glass bead blaster cabinet (like a sandblast cabinet) and had to work my pump over with that once.
