JW-Tools wrote:

If tough guys of poison ivy keeps on coming back, you have to re-apply
round up 3-4 times over the summer. Have anyone used Ortho Poison Ivy
Killer or Brush-B-Gone?

What does this have to do with ponds? Roundup won't work under water
and the other plant killers will kill everything else in the water
before they kill poison ivy.
--
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA