Thread: Changing filters

I currently have a Kockney koi Multi chamber 10000v on a 9000l pond. I’ve been told that when the koi get bigger the 10000v will need to be replaced (I currently have 4 koi at about 25cm and growing, thinking about 4 more next year when weather warms up). So thinking of a nexus 220 or 220+. My question is, how do you change filters without losing the benefit of beneficial bacteria on existing filter? Do you have to run the new filter along side the existing? If so, that’s complicated in terms of pipe work surely? Could I risk new pond syndrome with a replacement filter with the number of koi I have?

put the new media from the nexus in the pond or filter for a few weeks/months in warmer pond temps to mature in mesh bags.
before swapping the filters over.
its what i did when i swapped my filters this year...

im doing exactly the same plus added bio balls to the sacks they have being in temp pond for two months should be in new pond filters in about 12 days fome now.

keith

Fishless cycling is worth considering for new media