I have purchased cartridges a couple of time for my Canon i9900. Occasionally a cartridge leaks from the beginning. Because the price is so low, I throw the cartridge away. This is better than buying OEM cartridges from the big box office supply stores. In the past year $50 covered my ink cost. For seven year before that, ink was costing $225 to $300 per year. Preventing leaking cartridges can be maximized by very gently handling them when they are installed!