1. Cost of first time is relatively high, the output is expensive
2.The plant must have a knowledge and understanding of the technical options available, there is also need to have a good knowledge of plant nutrients, water and tools possible physiological effects of the plant digester control system.
3.There is a chance of disease, and the water is easy and difficult to control
4. Is the system that you want to maintain a close and want to people who have the knowledge, expertise, and experience in the care and treatment system will be successful
5.plant material such as sponge some slow digestion
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