My first suggestion would be to reduce the fish population. They multiply
over time, stressing the filter. I have to reduce mine from time to time.
Good luck
wrote in message
oups.com...
I have a pond in my yard probably 250 gallons. It has 9 big gold fish
in it from the previous owner. Without fail every year about this time,
I've been told due to heat and sunshine, the pond gets really nasty.
What should I use to keep it clear and clean?