ok , from personal experience i have found that brewing your tea does raise the ph like someone has already pointed out , but i must warn you that some organic growers spread the idea that no ph adjustment is necessary if you make your own organic teas , even though it does work that way to a certain extent it does make a massive difference if you take the time to get your ph between 6.3 and 6.5 , if your ph is to low brew it , if your ph is to low and you need to water straight away add the tap water with the higher ph to balance it , if the ph is to high add molasses (think the ph is around 5.5 or something) the microbes love it ,
either way there is only one way and that is experiment and experiment a bit more
dmc65- i dont think the roots mind what you use as long as the ph is within the acceptable range , i use phosphoric acid (when making a clean water solution) for ph down and that shit is corrosive , but if the ph is between 6.3-6.5 they love it as long as there are nutes in the soil to feed them.
happy brewing