I am setting up my first CaRx. It is a Geo 612 with a GLA regulator all controlled by an Apex. I am using ARM media. The highest I can get my effluent dhk is about 8.7. The solenoid opens at 6.5ph and closes at 6.7. I am pushing water through the reactor with a continous Versa pump. The effluent drips out at about 1 drop per second. I am having to manually add alkalinity to keep my levels up. I was expecting the effluent to be between 15 and 35 dkh. What am I doing wrong?