Water Changes For Ponds?

[Haveagojoe]

Does anyone do this? is it advisable to do a water change in the pond and if so how often, I clean the filter sponges every week I have to because of the dead algae the UV throws out and was wondering to do a water change at the same time.

 

[Cazgar]

I have a Small raised pond approx 300 gallons & do a large water change in the autumn & vac the bottom in readiness for winter.
I do another large water change in spring, I think my fish appreciate it, & I feel good about doing it