Detergent powder clumping in storage, what ingredient stops that?
Detergent powder clumps when it absorbs moisture from humid air, especially if it contains ingredients that draw water. Moisture-resistant packaging, dry storage, and the formulation’s balance of ingredients all affect it. Your detergent technologist should review the formula and packaging.
Sodium sulphate is a common filler in powder detergents. Taskon publishes Sodium Sulphate at 99% min. This page does not advise on detergent formulation.