Really don't want to poo-poo on a Canadian brand but I do agree with the general sentiment that with a price tag of $800, DIY will get you much further - and I want to back it up with a bit of data.
The main use case for these automated indoor gardens are salad greens and herbs. So while I also had success with fruiting plants, for an apple to apple comparison, let's look at a simple Kratky setup for leafy greens like lettuce, asian greens, and basils. Two months to first harvest, at least 4 harvests for the lettuces and probably 6 to 8 harvests for basils and I multiplied the basils by cuttings to get younger leaves, since the flavour is not the best when the plant has become a woody little tree. You can probably clone the same plant like that many times, and I have done 3 generations as shown in the last photos without any noticeable change in health, texture, or flavor.
Materials and Costs:
- 3 gallon food grade buckets x 4 (Free, from bakery)
- Hydroton (<$2 for the portion used from a 10L bag which would be like $5, not to mention it can be reused)
- 3" net pots x 8 (about $5)
- 3" hole saw (<$30)
- Grow lights (about $60 for a goose neck SANSI 4x10W, two of those is enough, so $120, and not a single bulb failed so far with 1 year of use, 18 hours a day, and you don't even have to trash the whole light fixture to replace a bulb)
- Nutrients GH Maxigro powder (used like <10g per bucket, even if you reset reservoirs weekly for 8 weeks, you need 320g for 4 buckets, so about $10 for the used portion of a 1kg bag that costs $30)
- pH up/down ($40 1 liter each, practically last you forever)
- EC meter ($15? Doesn't need to be too precise for leafy greens)
- pH meter ($25? Again, cheap ones are good enough for leafy greens)
- Smart plug for controlling photoperiod ($30, probably could be cheaper)
- Electricity (40 Watt x 2 lights x 18 hr per day = 1.44 kW per day, basically the same as the Rejuvenate, 1.4 kW per day on their blog post)
- Labour 2 hours per week to change the water (grossly overestimated because I take my time when working with plants; for most people they can't actually make money during the same time they care for the plants so it is not fair to include the labour cost, but for the sake of completeness, let's take the average hourly wage in Canada of about $36/hr, multiply by 2hr/week for 8 weeks, that would be $576)
So there you have it, ~$277 without counting the labour and ~$853 counting the labour.
The flexibility and reusability of parts in the DIY system is much better though.
- Easier to clean
- Bulbs are easier and probably cheaper to change
- Power outage? Just move the buckets to where it can get some natural light for the time being, good luck with moving that machine and the egg shape casing would block a lot of the light anyways
Then there are the intangibles:
- Knowledge gained from actually running the hydroponics setup yourself can be applied to more advanced methods with more demanding plant types, and some knowledge is transferable to container gardening in general such as salt and pH management, and propagation by cutting with water/nutrient solution.
- The joy of knowing you reduced your environmental impact by building it up from parts that are mostly reusable, instead of buying a machine that probably will end up in the landfill as a whole unit
Edit: I think most people who are active on here are likely the kind of people who are already putting in way more effort for their plants than the average person would, and so, we really are just not their target market.