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Plant your seedlings
such as in the case that the grower would need to adjust root zone WC or EC
Compare this weight to the weight of the blocks throughout the growing cycle
It's a staple in countless grow rooms
MJ 15" x 20" 5 MIL Precut Black and Clear Vacuum Sealer Bags Grow Medium Plant your seedlings15" x 20"127 microns (5 mil)Super thick, durable and sealableEmbossed side allows for easy conforming to contents as well as easy vacuum sealingAll black for maximum privacy and protection of contents from lightFood safe: Made from BPA free, FDA approved materialsFits in all standard sized vacuum sealer machines (e. g. FoodSaver) UsesPreserves and prevents freezer burnSuitable for sous vide cookingKeep herbs fresh for storage or transport
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