You need an auto shutoff on ur or system bulk reef supply has them( if you don't already have on on it, out of ur or you will have a T that goes one to your DI and one to your fridge, on the DI your going to want to have a ball valve or some sort of shutoff. On the fridge line you will have another T one side will go to the fridge and the other to your pressure tank. You may want a check valve between your "DI" T and your pressure tank so that you don't use water from your pressure tank to feed your DI. If you don't you will not have any water in the pressure tank while making DI water. Hope this clears it up.
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