Bob wrote until the additional filter
medium I purchased, was flushed out of the filter, filling the pond with
these brown pellets that turned to brown mush

What the heck was that stuff? Filter media shouldn't mush out.

Here are some green water tips ~

~ Nutrients for algae are sun, new water, fish waste, fertilized run off,
rotting plants, blown in dirt.
~ New ponds and spring ponds need time for plants to get established, algae is
quicker at getting going.
~ add plants, of any kind, in the pond. Especially underwater plants.
~ Shade is good - provided by lily pads, floating plants or artificial shade
for part of the day.
~ LOW fish stocking (20 gallons per goldfish, 100 per koi after starting with
1,000 gallons) and *not* overfeeding the fish. Too many fish and too much
feeding is probably responsible for most pea soup water.
~ adding a combination mechanical and biological filter to screen gunk and
convert fishy ammonia waste.
~ build a veggie filter, run water through plants, as easy as floating water
hyacinth in your filter.
~ clean up dead plant matter and screen for falling leaves
in the fall.
~ water movement, occasional water changes of 10%
~ add a sludge consumer, concentrated bacteria.
I use A HREF="http://united-tech.com"http://united-tech.com/A
~ building ponds with bottom drains and skimmers.
~ do not use algaecides, they only make lots of suddenly dead algae
and that will feed the next algae bloom.
~ do not worry about algae that grows on things (substrate algae) this is good
for a pond
~ gently remove string algae
~ UV sterilizes work on suspended algae - are expensive.
~ patience and time ;-)

k30a
and the watergardening labradors
http://www.geocities.com/watergarden...dors/home.html