My RO/DI is hooked up to a 20g garbage can with a Kent float valve.
The float valve stays clean being in fresh water, if it were to stick you flood the can not your tank.
Then you can use your top up method of choice from the can to your tank. I've been using the Blue-line Tsunami AT-1 but there are others.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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