So, Ive previously written about my windowfarm that Im building. Im also currently working on a 105 gallon system for my friend +Evgeny Pogorelovs apartment. Its going to be a basic flood and drain on a timer. We have a 55 gallon aquarium, which will feed into our 50 gallon stock tank grow bed. Were currently planning to have about 5-6 tilapia, and grow all kinds of veggies. Ill update with pictures soon.
Right now, were constructing the frame that will hold the system. Weve cut all the wood, and painted it all white, and now we need to assemble and put it on wheels for easy mobility. The next step is plumbing; well use a 200 GPH pump. Were hoping to stay away from using PVC due to conflicting reports about PVC leaching chemicals into water over time. However, this may only apply to soft PVC, not hard PVC. We need to do a little more research before we buy pipes.
Heres what Pogo wrote to me about PVC in farming systems:
Found some resources that cite PVC as leeching dioxin, pthalates, and other toxins into water / food. Definitely want to avoid PVC piping in any operation we start. The safer alternative is biodegradable EVA plastic.
"See: www.aaa.dk/pvc PVC plastic is an environmental and public health hazard because dioxin and other persistent organic pollutants can be emitted into the air, water and land during its manufacture and incineration.
In addition, PVC products can leach toxic additives during use, and thus may harm patients receiving certain medical treatments.
PVC has come under scrutiny by the European Commission since 1997 resulting in the release of the Green Paper in July 2001 that highlights the dangers associated with its disposal, and in April 2001 the European Parliament adopted a resolution calling on the Commission "to introduce rapidly a policy on the replacement of softPVC, in so far as the current risk analysis of phthalates indicates that it is desirable to reduce the exposure of people and the environment".
These concerns have led increasing numbers of health care providers to search for alternatives. Grenaa Central Hospital, Denmark, substituted 95 percent of its PVC-products with safer alternatives without compromising safety and care, and found many of the alternatives to be more cost effective."
http://www.annieappleseedproject.org/nonalforplas.html
Heres a company that sells EVA piping: http://dir.indiamart.com/impcat/eva-pipe.html
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