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Originally Posted by Tracey2

Is there any reason if I didn't have the same space you have that I couldn't bypass the sw mixing container and have that be sump #1. So I would just close sump 1, rinse and drain, add salt and ro water and then turn it back on? Love your setup, thanks for your help.

Yes, that would work. But it advisable to mix SW for 24hrs or more before you use it. This would leave that sump out of commission for that length of time. You would also have to design that sump to be a good "mixer" as well as a sump.

That sump would also tend to be clean since you would probably kill anything living in there each time you dumped FW into it. That would probably be a good thing.