If you are dubious to start then just experiment with say a 100gallon water change to see how your pond/fish react.
If everything proves OK then you can up the volume changed as you think appropriate.
All I do is take a clean bucket ( kept for fish use only ) pour the right amount of dechlor for the new water volume into the bucket then get your hose pipe and add say 2-3gallons of water to mix it all up. Pour the mixed water around your pond then run your hosepipe and re-fill the pond.
Hope this helps.
Posted on Jun 21, 2005, 9:26 AM from IP address 135.196.99.93