Sodium carbonate is a pH adjuster that can also be found in bath, skin and hair products. It alters the pH of a product to improve stability over time. Every formula has an optimum pH to make it work best. For example, a formula that’s more acidic works better for soap scum removal. Its opposite, a formula that’s more alkaline, might be more effective as a carpet cleaner. We use pH adjusters to make sure we achieve the best pH for a particular job. Also, the pH of a formula can affect how long it lasts within a container – for example limiting its tendency to corrode a can, container or dispenser. Sodium carbonate can also be used as a builder that makes a product formula clean better by affecting the molecules in the formula so they work together better.