Rockwool Is Made From Basalt Rock and Chalk Rockwool is a horticultural growing media made from the natural ingredients Basalt rock and Chalk. These are then melted at 1600° C into a lava which is blown into a large spinning chamber, which pulls the lava into fibers like "cotton candy." If you have ever visited a volcano you have probably seen these fibers flying around in the air surrounding the volcano. Once the fibers are spun they are then compressed into a mat which is then cut into slabs and cubes. The rockwool granulates are just bales of uncompressed fibers. The process is very efficient, producing 37 cubic foot of wool from 1 cubic foot of rocks. Since rockwool is born in fire it renders the product chemically and biologically inert and creates the ideal growing medium for hydroponics. Since its development in Denmark in the early 1970's, rockwool has become the major vegetable and flower production medium throughout Europe and North America.
Return and Warranty Policy
- No returns after 30 days.
- Store credit only, no cash refunds.
- No returns on: bulbs, liquids, powders, soil, growing media, or hydroponic
- Items returned within 30 days, in new condition and original packaging, subject to
15% restocking fee.
- Defective products will be warrantied when received within 30 days of purchase.
- Warrantied products will be replaced, no refunds or exchanges.
- After 30 days no warranties on: air pumps, water pumps, fans, fluorescent bulbs,
timers, thermometers, light hangers, or microscopes.
*After 30 days warranty fees may apply
**A $10 fee applies to all in-store warranty repairs.
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