CRX Media by Media Bros. CRX is a non-toxic all-purpose media for removing color bodies, improving clarity and unlocking crystallization potential in live botanical oils. CRX is a high surface area non-swelling large format media designed to keep you running faster and safer by keeping in-line pressure drops in your system at a minimum. Pair with your preferred hydrocarbon solvent. It is heat treated, dried, and shipped ready to use. FDA Gras approved.