Could someone awnser this simple question plz ,

[Weezard]

YOUR GONNA LAUGH

..But witch is high on a ph chart 3 or 11, and witch ph is best to use ??

You are correct.
Laughed, and spluttered.
You mus' be have some excellent meds.

Here's da long answer 'cause ya made me laugh.

PH stands for Potential Hydrogen.
3 is a low number.
And, the lower the number, the more acidity.
PH 3 is ten times more acid than PH 4.
PH 7 is about neutral.
PH 11 would be very alkaline.

BWD is right about the soil range.:thumbsup:
Hydro will grow better at a lower PH than you want for soil.
As low as 5.2.
I let my DWC drift between 5.2 and 6.2.
Soil is mo' betta above PH 6 probably because it act as a buffer.

Thanks for the chuckle.
Weezard.