I see the manufacturer is forthcoming with information about it
Ingredient Information:
Components of this product comprises proprietary trade secret information.
http://www.easycarewater.com/files/S...20-%202011.pdf

In the Q&A they indicate you have to keep fc between 1.5 and 2.0ppm for 2-4 weeks. Depending on your CYA level, that might be a problem. For me to keep within 5% of CYA, I've got to be at 4ppm FC at CYA 80. Perhaps your swcg requires less cya, and 2ppm fc for a month would be OK?