Probably, in our opinion, one of
the best of all the filtration media which is available in the UK
Extremely inert - and easy to service ... It is available in sheet
form and can be cut to the desired sizes to fit your filter chamber
by using an Angle Grinder or better still .. an ordinary Circular
Saw ... but be careful... and wear protective
glasses ... and watch those fingers .. unlike the fins on our Koi ..
fingers don't grow again ..