i just spotted this thread so here is a video you might find interesting
i've been wanting to try this for some time now but, sadly, my life
has been too fraught with complications to deal with this at this time

i will try to embed it but heres the link just in case
YouTube - Hydroponic recirculating solar powered system

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/J2hm5o5NjOs&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><embed src="http://www.youtube.com/v/J2hm5o5NjOs&hl=en&fs=1" type="application/x-shockwave-flash" allowfullscreen="true" width="425" height="344"></embed></object>

what am i doing wrong with this embedding shit?

anyway, heres another you might find useful
YouTube - Building a Cruising Hydroponic Garden