Hi Jeff,
The ATO used to be a simple reservoir with an aqualifter pump controlled by 2 float switches back when it was connected to my 55 gallon system. I modified it for this setup because I now have about 130 gallons of water and the 6 gallon tank only lasts about 3 days.
Now I Teed into the RODI Output and ran a line directly to the 6 gallon tank and installed a float valve to shut off the water. Then the aqualifter pump pumps water through the kalk reactor to the sump. The Aqualifter is still controlled by 2 float switches. One turns on the water when the level drops and the other is a backup that will shut off the water if the first one fails in the on position. I have been leery about connecting a line directly to the ATO from the RO unit because I didn't want to possibly overflow the sump if the ATO didn't shut off for some reason. Now if the float valve sticks open it will overflow into my floor drain, not the sump and the safety float switch should prevent the sump from overflowing.
The Kalk reactor was a design Jerry Orn showed me using a basic water filter with the cartridge replaced with a piece of tubing. Then it is plumbed backward so that water runs down the tube into the Kalk at the bottom of the filter and back up and out of the reactor to the sump. Because the kalk sinks to the bottom and the flow from the aqualifter is slow clear kalk saturated water is supplied to the sump and the kalk is stirred by the slow flow of water from the pump. I picked up the filter from BRS for under $20 and it works great.
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