Aluminum sulfate, alum, is most commonly used industrially as a coagulant in water treatment plants. Being water soluble it’s used in treating both wastewater and potable water. Used as a flocculant in order to get the water as clear and particulate free as possible.
Often, raw water, has particles that are too small to be removed by filter. The alum causes these impurities to clump together to either settle at the bottom or be easily filtered out. Turbidity and color are also resolved because the alum promotes coagulation of fine particles. When applied properly, and given enough time to work, alum
The alum promotes coagulation of fine particles which helps resolve problems of color as well a turbidity. If the process is given enough time to work and is applied properly, it not only corrects problems in the water but actually results in the removal of most of the aluminum.
Aluminum sulfate is used as a mordant in the dyeing process. It is used on paper and fabric as a dye fixative. Aluminum sufate, creates the sludge-like aluminum hydroxide when mixed with water. Along with aiding textile dye absorption, the alum, also makes the fabric’s dye water insoluble. Hence, they won’t bleed when washed.
Aluminum sulfate is used in gardening to lower soil pH for acid loving plants including: azaleas, grapes, hydrangeas, strawberries, and blueberries.
Aluminum sulfate is used in pools as a flocculant that quickly clumps together all the fine particles in your cloudy water, including green algae, so that they sink to the bottom of your swimming pool. Afterwards, simply use the vacuum to clean the waste.