Review on 🌿 FZONE 2.5L Aquarium CO2 Generator System: Complete Kit with Regulator and Needle Valve for Thriving Aquarium Plants by Lauren Perry

Based on the solenoid, I give this product 5 stars, ZRDR 4. If you need a new solenoid for ZRDR, check the FZONE listing. Fits, but has not been tested for leaks. The FZ magneto definitely runs a lot cooler and appears to use less power. (Output 1A for ZR power supply, 0.5A for FZ.) If you need complete aquarium installation, ZR kit is more complete. Extra spare o-rings, solenoid tube and base (FZ options), tank diffuser, check valve, etc. ZR has a key for the solenoid valve, FZ does not. (12mm for ZR, 14mm for FZ). If you don't need that extra stuff, the FZONE plus magnet is a bit cheaper. The FZ includes a measuring cup and the funnel is less likely to clog when pouring powder. ZR saves the most space because it folds up. The direction is not very good for both, a little worse for the FZ. For example, you are told to use 200 grams of one powder and 220 grams of another powder, but don't specify which one.