"Easy peasy"
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I bought one of these for my tomatoes last summer and found it really practical. I found the water lasts a week or so in sunny weather. Last year's rain meant they lasted a few weeks between waterings as there's a valve inside that waters only when the levels drop. Given you can keep the plants constantly watered and fed, I tried two plants per pot and had a decent crop all summer so it helps save some compost. I'm coming back this year for the extension kits and I'll let you know how I get on. The only drawbacks are once set up it is fiddly to move around but no more than a growbag, and the bucket bit needs raising up on something or the water doesn't flow.
