Hmmm in my experience I haven't had a dosing pump clog, regardless I would probably use a cetrifugial pump if anything. I do really like your over flow idea, it's more simplistic and more cost effective as I could implement it with just one more valve off the RO header.. I'll update that drawing in a bit.
To address your comment about the SW mixing tank not being needed, I agree that on paper it is not needed,however practically I think it is. If I allowed SSW water to mix with RO water in the sump it would be very hard to control the ratio or have any confidence that the right mixture was achieved until it's a little too late. Also because I will most likely have to use equally rated pumps for both RO and SSW ratio control will have to be done on a time basis...I.e SSW pump on for 1 minute RO pump on for 7. During the 6 minute period the RO pump is on, the sump will have too high of a salt content and this water will be sent to the display tank and could potentially do harm.
I see many advantages in having a third mixing tank, only disadvantage I can think of is cost and space.
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