The GH booster rules out everything that the KNO3/KH2PO4/Traces do not.

The Barr's Matrix will have some K+/Mg in it as well and be a mixture of trace metal gluconate weak chelators and stronger DTPA metal chelators as well as a host of amino acids, hormones and very tiny amounts of non essential trace metals.

Takes the ratio of metals and traces and makes a different ratio specific to aquatic plants and practical use, as well as the best chelators for the various tap water KH's.

It'll work well when dosed daily as well as 1-2x a week folks.
I will be selling it in June 2007.

Regards,
Tom Barr