Does anyone have any experience using Dry Ice to increase CO2 levels?

If so I am very interested and have some questions:
1) How much dry ice do you need (per plant) for it to be effective?

2) How much does dry ice cost?

3) Where do you get your dry ice?

4) If I'm not mistaken CO2 (dry ice) freezes at a much lower temperature than H2O (water). Common sense would tell me that this would mean it is impossible to store dry ice for more than a few hours unless you had a way of keeping it that cold. Would a normal food freezer keep it cold enough to store it for weeks at a time? Is it possible to store it for weeks at a time so one could buy it in bulk and use fractions of it a few times a week for a number of weeks?

Thanks for any help you can give
JohnnyPotGrower Reviewed by JohnnyPotGrower on . Dry Ice CO2 Does anyone have any experience using Dry Ice to increase CO2 levels? If so I am very interested and have some questions: 1) How much dry ice do you need (per plant) for it to be effective? 2) How much does dry ice cost? 3) Where do you get your dry ice? 4) If I'm not mistaken CO2 (dry ice) freezes at a much lower temperature than H2O (water). Common sense would tell me that this would mean it is impossible to store dry ice for more than a few hours unless you had a way of keeping Rating: 5