Hello kiwi2,
There is no chart that I know of for pot sizes for different type of systems and/or plants. There are just to many variables, type of plants, as well as plant sizes for that to be accurate at all. I'm not sure what other plants you are planning, or even how you have designed your system. But I wouldn't want any less than 5 gallons of root space for tomato (indeterminate) plants. Or possibly 3 gallons of root space for the smaller bush (determinate) variety's. All the roots don't need to be in the basket (growing container). But if not, they will need to be kept from drying out, and still need the space to grow. Hopefully without clogging your pluming, or at least easy to unclog (easy maintenance).
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