Good but expensive is the word for the products...
Will not promote algae? That largely depends on the user itself though...a bad user can rear an algae farm no matter what he or she uses though.
Personally, I would rather you use hydroponic chemicals which are cheap, flexible to use and last a long time. Unless you have deep pockets and money to burn go the hydroponics chemical way. KNO3, K2SO4 and KH2PO4 is all the chemcials you need other than the regular traces (TMG or flourish..).
Regards
Peter Gwee
Plant Physiology by Taiz and Zeiger
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