That's a 3-1/2 gallon resivour. The nice thing about this unit is that it comes with an auto on/off valve. You can hook it up to a float and have it make ro/di water on it's own when needed. And you alway's have 3-1/2 gallons of water raedy to go.
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Gary
CAN'T WE ALL JUST GET A BONG!?!
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