I'm surprised after reading Norm Meck's stuff that you pose the
question(s).

I haven't asked any questions in this thread so I'm not sure what you're
referring too.

The only problem with "it's the filter" are my filterless ponsai or lily
pond with lots of plants, no suspended algae and clear water.

I never said a filter was necessary to remove algae or that plants don't
work. I said plants alone are not sufficient. I also said I bought lots
of plants a year ago hoping they would clean up my pond and they pretty
much just died. This agrees with Meck's web site.

I originally said take the idea of just adding plants to remove algae
with a grain of salt because there's more to it than that. That other
part is, contrary to conventional wisdom, algae is killed from rotting
algae and some type of bacteria and not that plants out compete the
algae. So, while plants remove nutrients from the water (and should
therefore be encouraged) they are only part of what it takes to clear
green water.

Matt