Dang! 27 days? That is an impressive mix of chemicals! Fluoridone or another product, Kelly?
It wasn't fluridone. It was
CLIPPER (registered for aquatic-use in 2011). Actually, the watermeal's response was dramatic within two weeks - but overcast conditions didn't allow a decent follow-up photo until 27 days after treatment (DAT). The "lacing topical application" describes a straight-stream spray-pattern projected in a zig-zag pattern while walking around the pond's perimeter. In other words, it did NOT require "blanket-coverage" to do the job.
Fluridone would've worked too (though
much more slowly) and its residual would last longer, but only IF a pond is NOT subject to transient water-flows for 30-60 days. Otherwise, for fast results in ponds that have moderate water-transition or are subject to flow-through events, CLIPPER has shown to be a great option.