What ingredients do these contain? Want to know if it is safe to put them in flat soda to recarbonate.

I would not think so. Does not say for human consumption. Spend your money on new soda ....

How often should they be used?

Never, they don't work. They never dissolved.

How often should you use these and whats the correct way

Every day and place in the filter to dissolve with out having bits of it moving around in the tank witch looks bad but by putting it behind the filter cartridge it will release co2 gradually til its dissolved and its just how I did it and it worked great

How often must these be replaced?

Depends on how much co2 you want in your tank

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CORISRX ISTA Co2 Plant Tablet 100 TAB Carbon Dioxide - Planted Diffuser Tablets by Aquarium Equip

Product ID: 266357380

Details

Brand
CORISRX
Item form
Tablets
Item weight
150 Grams
Liquid volume
100
Unit count
100 Count

⏳2-hour gradual CO2 release

🌿Boosts aquatic plant growth naturally

💧100 tablets per pack for long-lasting supply

Description

🌿 Elevate your aquarium’s green game—CO2 made simple, effective, and fuss-free!

BULK VALUE PACK - 100 tablets per pack means you’re stocked for months of lush, vibrant aquatic growth.
EFFORTLESS CO 2 BOOST - Just drop a tablet and watch your plants thrive without complicated setups.
VERSATILE PLANT CARE - Perfect for aquariums and even drought-stressed garden plants—expand your green thumb’s reach.
BOTTLED GAS ALTERNATIVE - Delivers the same powerful effect as traditional CO2 gas systems—no bulky equipment needed.
CONSISTENT 2 HOUR RELEASE - Gradual CO2 diffusion ensures steady nourishment for optimal plant health.

CORISRX ISTA Co2 Plant Tablets provide a convenient, equipment-free method to supply carbon dioxide to aquarium plants. Each tablet dissolves over approximately 2 hours, releasing CO2 gradually to promote healthy, vibrant aquatic plant growth. With 100 tablets per pack, this product offers a cost-effective alternative to bottled CO2 systems, suitable for both aquariums and supplemental garden plant care.

Specifications

ASIN	B00POM74IK
Brand Name	CORISRX
Customer Reviews	3.8 3.8 out of 5 stars (218)
Item Form	Tablets
Item Weight	150 Grams
Liquid Volume	100 Milliliters
Manufacturer	ISTA
Manufacturer Part Number	I510 ISTA CO2 100pcs
Model Number	I510 ISTA CO2 100pcs
Pet Type	Fish
Target Species	Aquatic Plants
UPC	763230260513
Unit Count	100 Count

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