RO water

willist0

Reefing newb
Can someone please tell me the difference between RO and RO/DI water and can I use plain old store bought RO water for top offs?
 
RO/DI is also deionozed as opposed to just being reverse osmosis. You can absolutely use the RO water from the grocery store for top off. Just be sure they post their dates of maintenence.
 
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