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 5.5L Aquarium CO2 Generator Kit for Plant Tanks

Product ID: 543084856

Details

Brand
FZONE
Item form
Liquid
Item weight
3.24 Kilograms
Liquid volume
5.5 Liters
Number of Packs
1

⏲️12V DC solenoid timer for customizable CO2 injection

⚙️Precision needle valve with bubble counter, 1 bps control

🛡️1.5mm SUS304 steel, 25% thicker for max 1137 PSI

Description

🌿 Elevate your aquarium game with precision CO2 control — because your plants deserve the best!

PINPOINT CO 2 CONTROL - High-precision needle valve with integrated bubble counter lets you dial in a steady 1 bubble per second for optimal aquatic plant growth.
ECO WALLET FRIENDLY - Say goodbye to costly disposable CO2 canisters; this refillable system cuts costs and environmental impact with just $3 refills lasting 3+ months.
SMART TIMED INJECTION - 12V DC solenoid valve on a timer lets you schedule CO2 release, maximizing efficiency and reducing waste.
DIY FRIENDLY COMPLETE KIT - Everything you need in one sleek 4L system—easy assembly in under 30 minutes, perfect for millennial aquarists who value hands-on control.
INDUSTRIAL GRADE DURABILITY - Robust SUS304 stainless steel bottle withstands pressures up to 80kg/cm², ensuring safety and longevity.

The FZONE 4L Aquarium CO2 Generator System is a professional-grade DIY kit featuring a thick SUS304 stainless steel bottle capable of handling pressures up to 1137 PSI. It includes a precision needle valve with a bubble counter for fine-tuned CO2 delivery at 1 bubble per second, and a 12V DC solenoid valve with timer for scheduled injections. Designed for easy assembly and long-term cost savings, this system offers millennial aquarists a reliable, eco-friendly alternative to disposable CO2 canisters, enhancing aquatic plant growth with consistent, safe CO2 supply.

Specifications

ASIN	B08THYYFMN
Best Sellers Rank	#85,991 in Pet Supplies ( See Top 100 in Pet Supplies ) #5,912 in Aquarium Accessories
Brand Name	FZONE
Customer Reviews	4.4 4.4 out of 5 stars (1,002)
Item Form	Liquid
Item Highlight	Easy to recharge, DIY CO2 system, stable CO2 output, safe and reliable, regulator, CO2 diffuser
Item Weight	3.24 Kilograms
Liquid Volume	5.5 Liters
Manufacturer	FZONE
Manufacturer Part Number	FZ-4LKIT-US
Model Number	FZ-4LKIT-US
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish and Plants
UPC	764595876395
Unit Count	1 Count

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