Thank you, I have focused on this version which is lower:
http://royalexclusiv.net/Dreamboxes/...ume::1436.html
I assume based on your description that if the feeder is filled with a saturated limewatersolution including unsaturated CaOH at bottom and with no mixing possibility the actual adding of RO water will cause the unsaturated CaOH to be pumped into the sump. Which obviously is not good for the system.
Anyway the outlet is still somewhat unclear to me?
And how does RE think this feeder can be used for limewater as mentioned in the link?