To address the power-washer concerns, the washer has been used by me
only. It has only had water used in it. Nothing else, nada, no
detergents, no fertilizer, nothing except water from a hose receiving
the same municipal water. As far as what the fish look like when I
put them in. This does cause me some concern. When I first put the
fish in, it appears as if something really irritates them. Most of
the fish I have witnessed appear to intermittently dart around for
about 2-3 min, and then appear to settle to the bottom in a upright
(i.e. apparently resting) position. One of the goldfish that was
first added, I found had actually jumped out of the pond. I put it
back in, and it died within 10 mins. I have then witnessed several
fish die within 10-20 min. I think this makes it clear that there is
no other creature/critter involved in killing them. It further seems
to support some toxin/strong irritant killing them. Upon dying, I
have really not noticed any redness anywhere on the fish. They simply
look completely normal except they are limp and dead.