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

BACKFLOW PROTECTION - Integrated check valve in the bubble counter prevents water from damaging your CO2 tank, extending equipment life.
SMART TIMER CONTROL - 12V DC solenoid valve lets you schedule CO2 injection times, giving you full control over your aquarium’s ecosystem.
PRECISION CO 2 DELIVERY - Equipped with a high-accuracy needle valve and bubble counter, achieve steady 1 bubble per second CO2 flow for optimal aquatic plant growth.
INDUSTRIAL GRADE DURABILITY - Crafted from 1.5mm thick SUS304 stainless steel, this reactor withstands pressures up to 1137 PSI, ensuring unmatched safety and longevity.
COMPLETE DIY KIT WITH WARRANTY - Includes regulator, needle valve, and stainless steel bottle; backed by a 1-year warranty and 24/7 customer support for peace of mind.

The FZONE4L Aquarium CO2 Generator System is a professional-grade DIY kit featuring a robust 1.5mm thick SUS304 stainless steel bottle, precision needle valve with bubble counter, and a 12V DC solenoid timer. Designed for 600-800g of raw material, it delivers safe, accurate, and customizable CO2 injection to optimize aquatic plant health. Backflow protection and a 1-year warranty make it a reliable choice for serious aquarium enthusiasts.

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Package Dimensions	43.7 x 27.8 x 17.7 cm; 3.32 kg
Manufacturer reference	FZ-4LKIT-US
Item Form	Liquid
Size	2.5 l (Pack of 1)
Number of Items	1
Quantity	1
batteries required	No
Batteries Included	No
EU Energy Efficiency Label	A+++
Item Weight	3.32 Kilograms

FZONE 4L Aquarium CO2 Generator System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for 600-800g Raw Material

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