Check the listing for details. Fluval 88g-CO2 Bubble Counter - 3.1 Ounces. Condition: New. Listed at 9.09 USD. Fluval 88g-CO2 Bubble Counter - 3.1 Ounces Features Counter for planted aquariums Designed to accurately monitor CO2 dosing Helps keep and maintain a healthy aquarium Made in USA Description Since all planted aquariums lack CO2, it is extremely important that they are supplemented with it. In fact, 40 to 50% of a plant’s dry weight is composed of carbon. For optimal condition of aquarium plants, some CO2 supplementation is necessary. Payment We accept all major credit cards and PayPal. Shipping Free Shipping anywhere in the Continental United States. Please be certain your shipping address is correct as this cannot be changed once the order has been placed. Returns Should you need to return your purchase, we allow returns that are processed within 30 days of receipt of the order. Please contact us for a return authorization and the return shipping address.