Used as a water softener, the soda ash gives the water an alkaline taste. this process is used in buildings every day to soften the hard water and can be added to the laundry wash cycle, adding soda ash to a pool or hot tub that has a high ph level will reduce the ph in the pool. this helps stabilize the alkaline levels, use the soda ash for tie dying. the soda ash is recommended to insure that the dye properly bonds with the fabric, use soda ash as an additive in baking. it is used as a stabilizer, raising agent and an anti-caking agent, use soda ash mixed with water in a spray bottle to remove mold from wood surfaces as well as other materials.