i REALLY wouldn't hook your RO/DI to your tank. hooking your tank to a continuous water supply can cause nasty problems if a float switch fails.
You could instead set up the RO/DI to a resevoir that holds say 10 gallons, then top off from the resevoir into the tank using something like a tunze osmolator or a JBJ auto top off. cuts your chance of problems down in half...
if the JBJ/tunze top off fails you have only like 10 gallons dumped into the tank. if the RO/DI fails you have water all over the floor but your tank will be ok.
I just make a bi-daily chore of hauling water to my tank's top off resevoir (JBJ auto top off).
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Everything I put in my tank is fully dependant on me.
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