Organica Aqua Stim is a natural growth stimulator specifically formulated to promote healthy, controlled growth in aquatic pond plants. It is the ideal nutritional supplement for both potted and floating plants. Aqua-Stim is "not a fertilizer" but rather a comprehensive aquatic plant growth stimulator derived from natural marine plant extracts. When used as directed, Aqua-Stim will promote lush foliage and spectacular blooms throughout the growing season. More importantly, Aqua-Stim does all of this with natural plant extracts....NOT nitrogen or phosphorus, therefore, it won't stimulate algae blooms. One quart of Aqua-Stim treats up to 40,000 gallons of pond water.