15 tabs = 50 oz box of powder. Fast dissolving. For dishes so clean they shine! A technological advancement in automatic dishwashing from the makers of Electrasol. Each Electrasol Tab has dual action cleaning power to gently remove the toughest food stains and deliver sparkling clean dishes. The blue layer contains a special agent which naturally breaks down stubborn food stains like dried on spaghetti sauce and oatmeal. The white layer is a super concentrated detergent which contains baking soda. It removes the toughest stains and gently scrubs your dishes, glasses and silverware sparkling clean. Electrasol Tabs are convenient, pre-measure and dissolve completely like a gel detergent. No mess, no measuring, no waste. Safe to use on china and glassware. Phosphorus Content: The formula for Electrasol Tabs averages not more than 8.7% phosphorus by weight, in the form of phosphates, which is equivalent to 1.74 grams per tablet. (15 Electrasol tablets provide the same number of complete wash loads  as a standard 50 oz box of powder [calculated using weight average of the detergent dosages recommended by U.S. dishwasher manufacturers]). Electrasol Tabs are safe for septic systems.