We have a rule in the koi world that states prepare both the pond and filters prior to winter in late autumn , carry on throughout the winter doing water changes draining 30% through the bottom drain to flush the vortex then slowly trickling the water back in so as not to loose temperature ( it does work but takes a few hours to top back up again).
In the spring prior to summer we do our filters once again carrying on with maintenance again with 30% waterchanges.
With this method you avoid any Areomonas that are lurking in your filters waiting to attack your fish/Koi in the spring , it works very well indeed with no losses
rgrds
Dave
In the spring prior to summer we do our filters once again carrying on with maintenance again with 30% waterchanges.
With this method you avoid any Areomonas that are lurking in your filters waiting to attack your fish/Koi in the spring , it works very well indeed with no losses
rgrds
Dave