THANKS!!! really!!!!useing vinegar lemon juice etc. will work for adjusting ph but it doesnt work as good as the stuff from the hydro store,when I used it my ph had to be adjusted every day,with the hydro stuff I dont have to adjust it as often,also most nutes today have ph buffers to keep the ph in balance,so if your mixing your nutes right your ph should end up around 5.8 anyway,when my ph starts to drift is when I change out my res.