The Ultimate Value.  Best for: Power users who want the lowest gas price in the country. What’s Inside: 4 Brand New 60L CO2 Cylinders + 1 Prepaid USPS Return Label. The Refill Rate: Shipping back 4 empties triggers a refill order for $80.99 ($20.25/ea). How it Works: This is the most efficient way to exchange. Four empties go in, four full ones come out. The "Scan-Trigger": The moment your 4-pack return hits the mail, our system bills you the discounted rate and ships your next round. The easiest, cheapest way to sparkle. 🌍 About FIZZIT CO₂ Our cylinders are filled with high-purity, food-grade CO₂ for crisp, clean bubbles every time. Your sparkling water stays fresh, pure and tasty — exactly how you want it. ORGANIC & SUSTAINABLE At FIZZIT, we proudly obtain our organic CO2 through eco-friendly and sustainable methods, all sourced within the USA.   60 LITERS OF CARBONATION With FIZZIT, you’ll never run out of bubbles. Each of our canisters provides enough CO2 to carbonate up to 60 liters of water. ECO-FRIENDLY Each 60L canister of our organic, sustainable CO2 prevents over 170 single-use plastic bottles from polluting landfills or oceans.