This may sound stupid

[HigherTheHigh]

So I'm adding to my hydro setup bit by bit and I'm looking into getting a oh controller of sorts and wondered the ones that do say there controllers do they actually adjust the water ph to what you set it at or do I still have to add the ph up and down by hand or do I put the up and down into the controller?


***UPDATE I got my answer and read it properly again.

 

[Noone32]

Yes, no. Usually injected into the stream.