Dennerle Plants CO2 Starter Refill

The refill cartridge fit perfectly into my existing setup, and I love that it gives another full 60 days of CO2 without having to buy a whole new system. My crypts and stem plants have perked up noticeably since I swapped it in.

Refill got my bio setup bubbling again within a day, and it lasted nearly the full 60 days they claim. Way cheaper than swapping the whole kit each time. My crypts are finally filling in.

Saw new pearling on my anubias about a week after dropping this refill in, and the 60-day lifespan means I'm not scrambling to replace it every month. Cheaper than buying a whole new starter kit, which is why I keep coming back to the refill packs.