1. NO water changes, you just feed the algae that way.
2. NO more fish, you just feed the algae that way.
3. DON'T rinse your filter media with non-pond water, you just feed the
algae that way.
4. Throw some more plants in, you starve the algae that way.
5. Abide by the golden rule, STOP MESSING WITH THE DAMN POND!!!

BV.

These rules work well with my pond. However, I have lots of plant in a small
1000gallon pond and still suffered from green water this year. All it took
was one treatment with 'Green Away', an algae aggregating agent we get in
the UK, and it cleared over night. The plants grew at an amazing rate for
the next week, took over from the algae as main nutrient sink, and the pond
has stayed clear.

I think it all depends on the weather during spring, and whether plants or
algae get established first as the dominant life form. Algae seemed to be
winning this year (until I defeated them).

David
UK