"TrishaH40" wrote in message
...
I have a 4 year old 550 gal watergarden. 1200 gph pump in a skimmer. All
summer long last year I had green water (until Oct.) I had lots of
floaters
and o2-aters. I have 13 goldfish which I do not feed. A landscaper
suggested
I get a larger pump and a larger diameter hose to the waterfall. It
would
turnover the water at a faster rate, thus eliminating the algae. It is in
full
sun. I think its because the water at the bottom is not being
recirculated,
since the skimmer moves the water at the top. Any suggestions from other
experienced ponders?

I'd say your pump is plenty big but your hose may be too small or may have
restricted flow from four years of gunk build-up. Take the hose off and see
if the flow is significantly better. If so, get new hose or replumb with
pvc pipe. Use 1.5" pipe for reduced friction loss.

If you think circulation is a problem, put a diverter in and run a little of
your pump's output to a 'dead zone' at the bottom away from the pump and
waterfall.

Also, if your waterfall is small - as in rock surface area to splash on, not
gpm flow - google on 'trickle tower.' I have found those to be very
effective. They give more surface area for aerobic microbes to chew up the
N.