I personally feel micro is more powerful than gross and mind is more powerful than matter. So you can even get fantastic results by a small Pyra chip If you have programmed it adequately with pure love and intense will. but practically speaking numbers do matter. The minimum number of pyramids you will need are a set of 9 multiers in the center of each building. a minimum of 3 multiers needed to correct a defect. incase the defect is in a bigger area or of more intensity, then the number of pyramid yantras has to increase. The highest number of pyramids used in a single project are 500 large once like the Max or ProMax. I would only recommend just the right amount necessary… not more not less.