I've seen people use food grade stainless steel things like sinks and milk vats for aquaponics but I'm not sure the Fridge would really make a lot of sense to use, First most of the surfaces inside a refrigerator are probably not food grade so there is worry there. Second and probably more important, most referigerators are not designed to hold water and so the extra effort and expense of sealing it up will probably negate the benefits and I expect they usually are not all that deep either. I like fish tanks to have 24-30+ inches of water in them so the container is better if you can make it deeper than the desired water depth. A Fridge might work for a grow bed but then you have the issue of trying to plumb through it.
Might make more sense to use the fridge for some other purpose like making a solar dehydrator or something.
I expect they will last for a little while. I used one kinda like em for hydroponics for a while but then I had to line it because it started leaking, the foam isn't water tight indefinitely But it should work for a time.
Now I have that cooler with holes in the bottom filled with perlite and coir floating in my raft bed with sweet potatoes growing in it.
You can post pictures directly in threads by using the image button second from the left at the top of the post box next to the link button.
I just found a Freecycle Yahoo group for my county!
I hope you all can find one near you.
i found that out the hard way. i had 2 kinds of foam 1 was soft and let the water filter through slowly the others are very hard and dense (like blue board). i only need to get through the winter. calculate that the shadows will just hit the edge. in the summer i will switch to ponds
You can get free glass from local window replacement companies. The installers usually scrap the aluminum frames but they still have to dump the glass. Sliding glass door panels are usually pretty consistant in size. I have built a few really nice greenhouses with these panels. They are usually tempered so you cant cut them. Double paned units can be split with a heat gun and a razor blade if you do not want to use them as is or if they have leaked.
Yea, it is sometimes a hard less to learn NOT to step over the dollars to pick up the pennies. Some things may seem to cost more in the first place but by spending that little extra, you may be saving far more in other ways. My first big system pump was FREE, wanna know why a month later I went and spent about $500 on a new pump? (hint had something to do with an electric bill and a few minutes of calculation.)