Automatic flow-though water change system

[rickcasa]

Please let me know if this exact system, as I will describe it, is being utilized elsewhere. I'm determining it's effectiveness over the standard 10% wc every 2 weeks.

I want to use a 4x2x2.5 tank as a reservoir. I'm not too keen on the storage barrels and because they take up too much space. This 110 will be divided in the middle with a baffle and both halves will be salty! When one half is inline, the other is busy making rodi and manually mixed with salt when full. This will be ready when the first half is exhausted...and the cycle repeats. With me so far??

My controller will manage the pumps in the salt chambers with float valves. The frag tank, hooked up to the 50g fuge below as its sump (no skimmer), will get the influx of new water at a rate 3 g per day (1% of total volume). This will overflow into the return chamber of the DT sump. Now to get rid of excess old water, I need an overflow which drains out directly to the house plumbing. This I may put in the first chamber.

Any and all thoughts are solicited.

I wonder how many gallons per day is practical and effective?