Sure.. It doesn't get easier than this... I like simple automation so here's how I did it. BTW, this was suggested by reputable reefers here on RC. I use a reef fanatic ATO, which has two float switches that plunge on to the inside of my sump.. Switch 1 is set at where the desired water level is in the sump and switch 2 is about an inch above that, which acts as a a cutoff switch in case the first switch gets stuck or something (This is your fail-safe). I then have an aqua-lifter pump plugged into the reef fanatic that gets turned on every time the sump level drops enough to engage the auto topoff. The suction line of the Auq-lifter is inserted into my topoff container through the lid of the container where I drilled a hole just large enough for the tube to slide through and the other line is fed into my sump. To mix the kalk, I wait for my RO/DI unit to completely fill my topofff container, then I close the gate valve between the RO/DI unit and my topoff container so that it does not put any fresh water into the container as the topoff water begins to drop from being dosed into the tank. I then take a teaspoon and dump 1 - 2 teaspoons per gallon of topoff water into the topoff container. I then cover it up and allow a mag pump to mix it up for just a few minutes.. Once it settles for for about three hours or so, I plug in my Reef fanatic Auto Topoff unit and let it do its thing! That's it.. When it's time to do it all over again. I fill another container with Ro/DI the day before and transfer it over to the mixing bucket when it's ready for me to replenish it.. There are 4 important things to remember. #1 You should not allow any sludge from the bottom of the topoff container to be sucked into your aquarium (Simply stick the tubing that goes into your topoff bucket into a very short piece of drilled 1.5 inch PVC. That will ensure that the tube never hits the bottom of the container). That sludge is the stuff that could not dissolve and has a very high ph. #2 always keep a lid on your topoff container because room CO2 will be absorbed and render your concoction less effective.. #3 You don't have to mix again until it is time to make a fresh batch. #4 Don't worry about mixing too much kalk because only up to 2 teaspoons per gallon of water can dissolve. Whatever is left will settle at the bottom and be there for the next time you mix. Trust me, this will do the trick for you with PH while giving you the benefit of balanced CAL/ALK while binding phosphates in your system.. All pluses in my book. I would not come off the two part all together, because it's hard to keep up with CAL/ALK demands on a grown-out reef with Kalk alone. But, you will be able to cut down the amount of two part you are using. After running for a week or so, test your levels and adjust your two-part from there. I know this was a lot, but it should explain everything. Feel free to ask any additional questions you have and good luck if you decide to go for it.
