Use a grease trap, and do not pour grease, oils or fats down the drain. It contains a large amount of fibers and particles. Filters must remove these materials before gray water enters an irrigation system. Avoid using cleaning and laundry materials that contain boron. Do not use artificially softened water.
Softeners replace calcium and magnesium with sodium.
Do not recycle drainage water from swimming pools. Properly treated and continuously monitored gray water can be a valuable and safe resource for landscape irrigation. However, ignoring problems and not checking the system periodically can lead to human health and maintenance difficulties. Misused gray water can spread typhoid fever, dysentery, hepatitis and other bacterial and viral problems. Disinfection is critical for gray water held more than 3 hours.