Click and Grow 25 was created to grow edible greens in a continuous 5-week cycle, so one unit would provide 5 lettuces per week- every week.
This spacing is just enough that all greens are harvest-ready in 5 weeks after planting. We are using loose leaf type lettuce varieties, that do perfectly well with this layout and provide enough baby-leaf sized leaves just in 5 weeks. If you wish, you can grow only one type of greens or mix different types of greens to your liking.
The system does not have a pump. Plants are watered thanks to a passive wick system that is completely silent.