Assembly of the large Matala Biosteps filter—unaided by anything but the pretty-bad picture on the box—the instructions had a way of leapfrogging over the critical bit, like, which is the FRONT of this thing?—went fairly well.

And it did run nicely, and I have clear water.

Backflushing, however, poured everything back into the pond.

We have now come to our senses and realized that the most obvious thing, after we figured out all the rest of the really arcane stuff correctly—is to make the bottom hole the drain, and the TOP hole the inflow.

It was very wet and soupy getting this corrected.

That is all.