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

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

Product ID: 266357380

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Details

Brand
CORISRX
Liquid Volume
100
Item Weight
150 Grams
Item Form
Tablets
Target Species
Aquatic Plants

🌱100 tablets per pack

💧Dissolves in 2 hours

⚖️150g lightweight

Description

🌊 Dive into lush growth with every tablet!

PRECISION RELEASE - Gradual dissolution ensures a steady supply of CO2 for optimal growth.
TABLET TECHNOLOGY - No more messy gas canisters—just drop and watch your plants thrive!
SUSTAINABLE GROWTH - Supports healthy aquatic life while being eco-friendly.
EFFORTLESS CO 2 BOOST - Transform your aquarium into a lush paradise with just a drop!
USER FRIENDLY DESIGN - Perfect for both novice and expert aquarists—just drop and enjoy!

The CORISRX ISTA Co2 Plant Tablet offers an innovative and convenient solution for enhancing CO2 levels in your aquarium. Each tablet dissolves over approximately two hours, providing a steady release of carbon dioxide to support the health and growth of aquatic plants. With 100 tablets per pack and a lightweight design, this product is perfect for aquarists looking to simplify their plant care routine.

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