"Nedra" sez:
Fringe, I invite you to Physically visit my pond Before using BZT and
again After using it. The AFTER visit will have to be several days
after use. The Maintenance dosage has to be followed for BZT
to work as a claimed... I wait 3 weeks before re-using ... the clearing
of the bottom gunk is very noticeable.

Nedra

Ah, you misunderstood me. I wasn't saying I don't believe y'all on BZT.
In fact, I added it to my pond list this winter, but haven't found it (at
least as "bzt") at the local ponding stores.

I was just referring to the line:
You can see why it lasts so long ....
also, do you really think we would all use if it weren't
"worth" it??

"Everyone's doing it" doesn't tend to hold much pond water. You (and a few
others here) I largely tend to agree with on other pond things, so you get
more points in my book, but in light of the snake oil sold widely these
days the one sentence begged for a response.