When we study feng shui, we study qi patterns and how the qi flows. We then need to collect it in the correct place and be able to use it, be it in our homes, factories, businesses or larger scale projects. It is one thing determining whether there is readily available qi and quite another to be able to tap into it and use it correctly.

In order to check this available qi we need to look at the water mouths feeding the area and the source of qi coming to the particular area we wish to access.

Very often we have readily available qi at our property but we are unable to redirect or use it because of layouts or obstructions. Sometimes we have readily available qi which is of a negative quality and we need to block it from entering our property.
Only once we have established whether this qi is able to be used by the property concerned, do we look at the quality of the qi. In order to be able to assess the quality of this qi, we need to use our formulae.

The formulae, thus, do not create good and bad feng shui in and of themselves but are used purely to measure the quality of the qi coming to the property concerned.

It is, therefore, the job of a good feng shui practitioner to be able to see whether there is available qi reaching the property concerned and then to assess the quality of this qi by using all the formulae at their disposal.