Greywater collection or irrigation systems is not always simple to create and, depending on the design, can be quite expensive. In some places, you would need a permit to have one installed. To minimize the expense, it is important to assess your overall watering needs. If you only need used or greywater for cleaning outdoors, then there may not need an elaborate design; however, if you need to water plants and grow food, you would need a system that can filter the bacteria. There are also some requirements to meet, such as enough space and soil. Some of the common collection methods include drain to mulch basin, branched drain, constructed wetland and solar greywater greenhouse.
Drain to Mulch Basin
This type of greywater irrigation is the simplest method. It does not need a filter, pump or surge tank. It uses very little pipe and does not require a lot of maintenance. It is the cheapest and easiest to build-- anyone can build it. Furthermore, it has a low failure rate and can last for a long time. It is a simple connection from the household drain, commonly the kitchen sinks or bathroom sinks where a small piece of pipe connects to the drain and to the mulch basin. The mulch basin should contain a mixture of topsoil and mulch.
This method is similar to the first one as far as method; however, it is more elaborate because it involves multiple drains connected to several mulch basins. This means more materials would be required in order to disperse greywater to several locations.
This method is ideal for wet climates. It is good where soil perk is low and space is restricted. This method covers a larger area and collects larger volumes before reusing. Larger uptake of wetland plants can reduce the reuse efficiency of this method; therefore, it is not advisable to use it in dry climates. Construction p[ermit may be required and involves adding filters to further clean the greywater from possible unseen contaminants.
Solar Greywater Greenhouse
This is an expensive option among the methods mentioned here; however, it provides the highest ecological net grain for cold climates, provides year-round treatment of greywater, excellent for food production and it can also help heat the house by conserving the heat in greywater.
Before making deciding on which method you should use, consider the location, greywater sources, irrigation needs (small, medium, large), climate and water availability.