When I got home this evening, I tested the DT's alkalinity and it came back at 6.2. I dosed the tank to bring it up to 7.3, I will dose the tank again tomorrow to bring it up to 8dkh. I also tested the water in the SW container and the alkalinity also came back at 6.2, I dosed it to bring it up to 8DKH. Both the tank and SW container CA was 445, MG 1440. Seems like Fritz RPM has low alk, I've gone thru about four boxes of it and each time, alk has been low.
Tonight, I setup the KHG. It took me well over 2 hours to set it up and get it going. When you first setup the KHG, you need to calibrate the PH probe with PH 7 and 4 solution. Plug in the KHG, put the probe in the PH 7 solution and hit buttons 2 and 4 to set, rinse the probe with RODI, pat dry and put it in the PH 4 solution. Hit button 1 and 4 to set.
Your home's network needs to run on DCHP in order to connect to the KHG via it's web interface. I initially had trouble with this step. When you first plug in the KHG, it will try to obtain DCHP, once that happens, it will display the IP address assigned to it and the port number. You need to write down this info and plug it into the address bar in your web browser. I had to constantly reboot the KHG to try to get the IP and port number as the info went away quickly and sometimes it wouldn't get the DCHP. After I was able to log into the KHG, I then setup the timezone, DT water volume, where I like to keep my DKH (8), how much I will allow the KHG to dose a sodium bicarbonate solution at a time after each test.
The KHG will only dose a sodium bicarbonate solution of 1000ML of RODI to 65 grams of dry baking soda. The reagent uses 1500ML of RODI to dilute the reagent. I bought graduated cylinders for this process.
You also have to purge the saltwater in and saltwater out lines, this took awhile to complete. Then you have to purge the reagent in and reagent out lines, this took even longer as the doser only pulls up one drop at a time. Then you gotta purge the sodium bicarbonate in and out lines.
Coralvue recommends you run five test to break it in. See the pictures below of all five test. I also did two test with my Hanna PPM alkalinity tester and two test with salifert's alkalinity tester. Hanna came back both times at 7.28 DKH. Salifert came back twice at 7.3 DKH. The KHG thru all five test came back at 6.93, 7.04 and 7.05. I went with saliferts result and adjusted the KHG's DKH readings. The 6th picture is a test after the adjustment. There is also a picture of the KHG test log. I will post another snapshot of the log after a few days of testing. I have the KHG testing every four hours which is the max time between test. Overall, I'm happy with the KHG and it's repeat-ability.
First test
Second test
Third test
Fourth 5est
Fifth test
Final test after adjustment
Hanna test with the same results twice
Side note, this skimmer is kicking butt! It sure does earn it's name.