Which molecular sieve size is best for water absorption? Are any of the molecular sieves able to be reactivated in a typical house oven?

13X molecular sieve is best for liquid water absorption. All types of molecular sieve have to be baked at 550℃/1022℉ to be fully reactivated. If you use a house oven, the molecular sieve can be reactivated at some level, but not fully reactivated.

Are these 4A beads pre-activated or do I have to bake them before use?

They come activated! They work great!

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💧 Keep it dry, keep it fly! 🌟

COMPACT EFFICIENT - Each granule is sized for optimal performance, fitting seamlessly into your storage needs.
EFFORTLESS HANDLING - Designed with a dual-handle system for easy pouring and maneuverability.
VERSATILE APPLICATIONS - Perfect for various storage solutions—customize your usage with ease.
UNMATCHED MOISTURE CONTROL - Harness the power of 4A molecular sieve for superior moisture absorption.
HIGH TEMPERATURE RESILIENCE - Can withstand baking at 550°C for reactivation, ensuring longevity.

The Wisesorb 7.5 LBS 4A Molecular Sieve is a premium quality desiccant designed for effective moisture control. With a fast adsorption speed and the ability to absorb over 17% of its weight in water vapor, this versatile product operates efficiently in a wide temperature range, making it ideal for various storage applications. Its easy-pour container and dual-handle design enhance usability, while the granules can be reactivated for extended use.