Quote Originally Posted by tinytoon
when your water comes out at around 50f and your rez runs around 69f there is quite a bit of difference. Here is one to mess with your head a little, on pens that do not compensate for temp what is the base temp that such pen is set to??

Well Tiny, I just found a table giving the PH of water at various PHs and the difference between water at 10C and 20 degrees C is less than ONE PPM. I doubt any of us need to get it that close. Once there are some nutes in the water there is a bigger difference, but I don't think we really need to worry about that.

keylime