This reusable cartridge is easily filled with the included funnel. A bottle of PiezoFlush is included which has at least 236ml (8oz) ink. The Light Light Black position is the "unused" eight position of the Piezography K7 system. The PiezoFlush will only print during nozzle checks. PiezoFlush will keep this rarely used inkjet head in prime condition. The cart is clear and easy to see the ink level. It never needs resetting. When the cart is empty, simply order another bottle of ink to refill it. The costs of use of this system is extremely economical and friendly to the environment at the same time! Never throw away another one-time use cart!

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