This system has 1/4 corrosex to 3/4 Juraperle - this ideal if you have a low pH (less than 6) or you want to push a higher flow rate through the media. This system incorporates a "dome hole" vessel so that you can easily top up the media without having to remove the pipework and head. This is particularly useful if you want to tweak the corrosex to juraperle ratio to get the pH you require. As with all our kits the head, vessel and media are all included. Some assembly is required.