Planted Tank Enthusiast
Join Date: May 2003
Location: Blackwood South Australia
Dave I understand what you are talking about.
I think what is happening is that you need to recalibrate with all the liquids or you have your ph controller set around the wrong way.
To explain, lets say that your 4.0 is actually set at 7.2, then when the ph hits 7.2 the controller will think that it should shot off and it does.
So what you need to do is recheck the calibration and what your upper and lower factors are set at, then, recheck your set point.
If all this fails, get the unit checked by the manufacturer, it may be defective.
Hope that my explaination was helpful.
Eheim Pimp Club member #3: Scribe to the Eheim Pimp Club
90 gallon, CO2 dupla injection, Dupla substrate heating, Dupla Laterite with iron stone substrate, Aquastarlight future 3 x 150 metal Halides, Eheim 2026 pro2's and heavily planted with Discus