Finally!

[LCBkoi]

i took the plunge and upgraded my kockney koi filter slightly today by using fluidized K1 in the last chamber will convert the third chamber when the last has matured rather than do it all in one go; dnt want to mess the fish around too much...hope it does the job...but by the sounds of all you lot and your experiences k1 is the way forward
liam

[Gazza]

It will work and your fish and water will benefit from it and as long as the warmer weather stays a bit longer it will mature in no time