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      • Nutrient Control & Management
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    • Grow Tents & Sheeting
      • Grow Tents
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      • Budget Grow Tent Kits
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  • About us
  • Information & Resources
    • Looking after your mum - a guide to keeping perfect mother plants!
    • Propagating Success - how to propagate seeds and cuttings.
    • Growing With LED Lighting
    • Introduction to Organic Growing
    • Environment is Everything -perfect your grow room environment now!
    • Growing With Drip Irrigation
    • Establishing and Transplanting Young Plants
    • Winter Growing – changes to your growing style during the colder months.
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Critical Mass was formed by combining over 25 years experience in the Sheffield hydroponics industry including retail, wholesale and research and development. Founded by Ian and Colin after working for some of the best, and one of the largest companies in the industry we have a wealth of experience and knowledge and are able to provide the best service and advice available.

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