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The air dome is then covered with your preferred substrate and then you pot your plant as per normal. The air pump delivers oxygen through the dome into your root zone which can boost your yields quite significantly. The size of your air pump is governed by the number of domes you wish to use. The larger the project the more powerful pump will be required. Autopot recommend that you use a 50/50 mix of perlite with your chosen substrate to maximise results, however CocoTek PX coco is a 70/30 ratio mix that we would highly recommend as it is a very refined coir, its already per mixed with perlite and the results are just as good.