Thanks to o2manyfish and DonW
I want to thank both Dave and Don for the info gleaned from them both over the last week. Thanks to this information, my Ca, dKH and pH levels are back where I like them and the system is starting to hum again.
Over the last month or so, I have had some issues with my ph, Ca and dKH. pH was getting lower and lower, Ca slipped from 420 to 350 and dKH slipped to around 7 from 12. I have never run kalkwasser or a kalk reactor and until recently, my PM 422 had been keeping the Ca, dKH and pH very stable. I was slowly adding B-Ionic to try to raise Ca and dKH but not making any real headway (because it turns out I wasn't aggressive enough because of other issues). I spoke to Dave and he pointed out that my PM 422 should be able to keep everything in balance. He recommended some values for pH and dKH from the effluent. He also told me about a neat trick to enhance the effluent and raise the pH (drip the effluent into a cup with some CaC03 media). The residual C02 reacts with media and the extra aeration helps bleed CO2. I adjusted the effluent pH but hadn't figured out how to use a Salifert kit to measure the high dKH in the effluent. That's when the info in this thread helped. With Don's information I was able to determine the effluent pH was ok but the dKH was about 1/2 of what I wanted. I readjusted the PM 422 and got the effluent where I wanted it. I then measured the Ca and dKH in the tank and used the Ca/dKH calculator mentioned in this thread to calculate how much B-Ionic to add. I added about 1/2 the recommended dosage over 24 hours and then let the PM take over the rest.
Two days later, the PM has got everything locked in and stabile.
Again, my thanks to Dave and Don.
Ted