What is the reason for needing a solenoid? How will the system run without one?

The solenoid will control the co2 output. When turn off the solenoid, there will not be co2 out from the generator. If without the solenoid, the co2 will keep output.

How long do I have to wait before using the set up in my tank?

You can use it as soon as the needle is in the green.

How can i replace the needle valve. Mine is broken alternating between full throttle or 0?

This isn’t a replacement part for the co2 generator it’s valve for a co2 tank. I recommend contacting the manufacturer.

For a 4l co2 generator, should i put in 600-800 gram each of material a&b? also do i pour in 300ml water or more? i've read different opinions online.

I use 600 ml for the material each and 800 ml of water I freeze the water in try"s that make long round ice cubes the cube are made to put in water bottles

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FZONE 2.5L CO2 Aquarium System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for Aquarium Plant Tanks (with Solenoid

Product ID: 605905846

Details

Brand
FZONE
Item form
Liquid
Item weight
2.36 Kilograms
Liquid volume
2.5 Liters
Unit count
1.0 Count

⏲️12V DC solenoid timer compatible

⚙️Precision needle valve for 1 bps control

🛡️80 kg/cm² pressure resistance

Description

🌿 Elevate your aquarium game with precision CO₂ control and unbeatable durability!

UNMATCHED DURABILITY - SUS304 stainless steel bottle 25% thicker than standard for ultimate safety and longevity.
SMART AUTOMATION READY - 12V DC solenoid valve supports timer integration for perfectly scheduled CO₂ injection.
PRECISION CO₂ CONTROL - High-accuracy needle valve with bubble counter ensures flawless fine-tuning down to 1 bubble per second.
TRUSTED SUPPORT WARRANTY - Backed by a 1-year warranty and responsive 24/7 customer service, ensuring your setup runs flawlessly.
COST EFFECTIVE ECO FRIENDLY - DIY CO₂ generation slashes refill costs and eliminates disposable cylinder waste—sustain your aquatic paradise affordably.

The FZONE 2.5L CO₂ Aquarium System is a professional-grade DIY kit featuring a robust 1.5mm thick SUS304 stainless steel bottle capable of withstanding pressures up to 80 kg/cm². It includes a precision needle valve with an integrated bubble counter and check valve to prevent backflow, plus a 12V DC solenoid valve compatible with timers for automated CO₂ injection. Designed for aquatic plant tanks, this system offers cost-effective, eco-friendly CO₂ generation with a one-year warranty and dedicated customer support.

Specifications

ASIN	B0B5R18XDV
Best Sellers Rank	#81,360 in Pet Supplies ( See Top 100 in Pet Supplies )
Brand Name	FZONE
Customer Reviews	4.4 4.4 out of 5 stars (992)
Global Trade Identification Number	00689323444083
Item Form	Liquid
Item Weight	2.36 Kilograms
Liquid Volume	2.5 Liters
Manufacturer	FZONE
Manufacturer Part Number	2.5 L
Model Number	2.5 L
Pet Type	Fish
Target Species	Aquatic Plants
UPC	689323444083
Unit Count	1.0 Count

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