Hi,Jack Whatley is one of the most famous discus breeders in the world,he pioneered artificial rearing of fry,his fish are available in the USA,and are produced under franchise to him.The unit you have purchased is probably a mixed resin bed filter which will produce pretty pure water but will be exhausted quickly and need the resin replaced which is expensive,I would return it if you can.You can buy a n HMA from Devotedly discus,Ro-man or osmoticcs.co.uk,for around 50 quid,hope this helps Ray.