Shagrathanswered grow question 5 years ago Well I'm not sure how much hydroguard cost but I use Great white and it has LOTS of different beneficial bacteria and fungi (Including bacillus amyloliquefaciens that is in hydroguard). It is pretty expensive powder BUT when used correctly you have to use it only once per growth! You just need to give them food and kinda make a home for the bacteria and they will reproduce and do the magic!
Also Iäve read al ot of good stuff about mammoth P. Expensive too but only applied once or couple times per grow.