Hello,

I have been using the KHD to adjust Carbonate dosing for about a month now. First I used the adaptive mode and then switched to the add-on control mode about two weeks ago.

Normal carbonate dosing is set at 4ml 24x per day (96ml daily total).

When I had the adaptive mode I set it at a volume change of 100% and a max and min dosing limit at 50% with 4 tests a day.

I was getting daily variations of from 0.4 to 0.7KH.

So I decided to try the add-on control since I know how many ml of my carbonate solution are needed to raise the KH by 1 in my tank: 60ml.

First I set the volume change at 12ml and a max of 3 and a min of 3. Still pretty large daily variations.

Now I am trying the following:

- Increasing testing from four to six times a day.
- Kept the volume change at 12ml but the max is now 8ml and min is 4ml.

My thinking is that the combination of the increased testing frequency and the larger corrections will reduce the daily variations.

So my questions:

1. Do my settings make sense?
2. What are others experiences in terms of daily KH variations when using the KH control feature (and what are your settings)?
3. Which control method minimizes variations the most: add-on or adaptive?

Inputs appreciated!

Thanks, Laith