Hydroguard: 10^4 or 10,000 Cfu per mL
Southern AG GFF: 10^10 or 10,000,000,000 Cfu per ml
that is 1 million times more concentrated in terms of colony forming units!
Dosage:
Hydroguard: 2mL/gal or 20,000 Cfu per gallon (amount on packaging)
Southern AG GFF: 1mL/20gal or 500 million Cfu...