Never used hydrogurd or z7 but I kno a fellow grower who used grandpatokin n worked great for slime issues def will b adding I just love trying dif things that work still trying to find something that works well for me I'm using gh nutrients in hydro but next run will b using this one bottle that is used for veg n flower combined with hydrogurd or z7 im just tired of mixing like ten bottles to get me back in motion