Spirulina of the highest class, which as a great effect on "color enhancing", is assorted enough to make your Koi vivid scarlet.
This is a healthful food containing wheat germ, excellent in the digestion and absorption of nourishment. It is indispensable to the maintenance of koi's health particularly at a low water temperature. It's also the most appropriate for recruiting their health in spring and supplying nutrition before wintering.
This has been developed with a view to promoting "Healthy and Natural Growth for Koi", and it's a perfect, well-assorted nourishment food containing all nutritive substances, together with every sort of vitamins, minerals, etc..., required for the general rearing.
Filters that have not had water circulating through them for the winter should be cleaned well before turning the pump back on this spring. Cleaning will remove toxins that can develop from waste breaking down in the filter in the absence of oxygen. Once your filter is up and running, seed it with beneficial bacteria.