Triple Filtered Rainwater Starter with Algea Pack2 Pack2 contains two 10 oz bottles, each bottle is 10 oz. We triple filter the rainwater - High-quality dense algea - Perfect to be used as is or added to non-chlorinated water to grow your algea to fit your needs, simply add as needed to your tank. For storage place under bright light or under a window with plenty of sunlight. Please see our seller page for our shipping info and refund policy. Contact us with any issues and/or questions.