I don't know if anyone has mentioned this, but I'd have a reservoir for the RODI line instead of plumbing it directly into your tank. In the unlikely (just like every other disaster preceeding event that seems to happen just a tad too often in this hobby) event that the solenoid fails, it won't flood your system - it just floods a reservoir that could have a built in overflow system. It would involve one extra pump, but that could be the pump that saves your house from becoming a mess, and saving your tank from a crush inducing salinity swing.
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Spontaneously Purchased Scleractinian anonymous
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