I have built and used one of these before. They are a PITA! It's hard to upkeep and requires daily maintenance. Algae WILL be an issue. Mine worked awesome for a couple of weeks for vegging clones and seedlings. It quickly got out of hand and I had major damage to roots when I moved them to bigger containers. What happens is that you need to be able to spread the plants apart as they get bigger and that means trashing lots of healthy roots or starting seedlings/clones 1 foot apart which is a complete waste of space and light. Trust me dude, you'll waste time and money. Ask yourself if you're looking to have a successful garden or just a bunch of experiments. Find a setup in the forum that has proven success and go from there.
They use the floating raft design for lettuce so they can float it down long water beds - it acts kinda like an assembly line; when they get to the end of the line after so many days, they are transplanted to different containers and water beds. I don't think it would be what you want for MJ, especially because a heavy MJ plant would probably sink the raft, unless it was inefficiently large. If you're gonna do DWC and you want to put more than one plant in the rez, then just make a common Rubbermaid Tough Neck rez (18 seems the most common on this site), or make one out of a cooler (I think 120quart is a close equiv to 18gal) for cooler temps and easy draining.
THANKS, :] so ill show u what i got as soon as i get double A batteries for a camera but i can find pix on google for now..
so i had 3 plants going in soil... but i needed more soil.. later on cus they got bigger so i got dirt from outside.. but i forgot that the gardener.. freaking sprays the dirt outside with weed poisons... so 3 days alter my plants died after putting outside anti-weed soil with my good soil..
so thats like 3 expensive seeds down the drain (white widow)
so now im starting from scratch germinating another seed..in rockwoool..... in one of these..
im using it as a propogation chamber thingy
and i got a 5 gallon bucket and a really quiet air pump i got from petco.. so when it gets good enough i will move it there..
but the thing is... since i dont have a hole drill
im thinking about... just hanging my netpod thing in the air using some plastic covered wire... with the airstone below it..
i mean idk its what im doing i dont have pictures yet i bet you have a good idea bout what im talking about.. what do u guys think?