Hi All,

Im new to the forum and have bought a profilux 4 with khd and 2 stand alone 2.1 dosers. Im really struggling to sort the ph prob out. No matter how i calibrate either 4ph and 7ph or 7ph and 9ph it always reads 10.50 ph. My khd director gives an actual ph value of 7.1 and dkh of 8.8.

can anyone tell me were im going wrong please