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You can get whatever size you need. You should calculate how much water you go through in a day and go from there. My tank evaporates about 1 gallon a day and I do about a 14 gallon w/c weekly so that translates to about 24 gallons a week (I rounded up to 10 gallons a week for evap). I have a 24gpd RO system and that suits me just fine. Bigger tanks will need higher GPD ratings, but just be aware that you probably won't actually get the amount of GPD advertised. Most people find they get less than the unit is rated for.
 
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