Current Culture UC Evolution 18XL


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Under Current Evolution XL - 18 Sites.

The Under Current® system is the world’s only recirculating water culture hydroponic system to feature our patented Sub-Current Culture® circulation method.

  • 2-3 Weeks Veg Time
  • 8 Gallon
  • 25" Spacing
  • 3-4' Plants
  • 3 rows with a choice of 9, 12, 18 or 24 sites.

Sub-Current Culture® (SCC) technology utilizes negative water pressure to recirculate hghly oxygenated nutrient solution through the plant’s root zone. This continuous fluid motion supercharges the nutrients with dissolved oxygen, creating hyper-aerobic conditions perfect for explosive plant growth. Constant 24/7 nutrient circulation ensures pH and EC levels are uniform throughout the entire system.
Our unique water culture application is unprecedented in layout versatility and ease of use. The Under Current® consistently delivers awe-inspiring yields for any sized application, from hobby to commercial greenhouse.

2019 Under Current® Updates

  • CCH2O Multi Mod - The Most Versatile Hydroponic Growth Module Available. Recessed Drain Well for Full System Drain. Raised Body for Thermal Cooling.  Greenhouse Grade Heavy-Duty Construction. Water Level Marks and Smooth Interior for Easy Cleaning.
  • CCH2O Add Back Kit  - Easily Add Back Nutrients and pH Adjustors to Your System Without Shocking Plants.
  • High-Flow Aeration Manifold - Even Distribution with More Air to Plants. Clean & Organized.
  • Air Pump Bank with CCH2O Air Flow Regulator - Easily Calibrate and Standardize Aeration Rates. Removes Air Pumps From Grow Space.
  • 5.5” CCH2O Lids & Net Pots - Less Media.  Easily Transfer Plants from Veg to Bloom.
  • Wider Center Aisle, 1” Return Hose & Bottom Drain Manifold - More Room Between Rows. High-Flow Circulation. Lower Volume to Prime Pump.
  • UC Drain Out Kit - Utilizes the CCH2O Drop Tee to Connect the Multi Mod Growth Modules.  Provides A Centralized Point for Evacuation When Performing a Full System Drain.
  • Grow Trees - Yield More with Less. Reduce Plant Counts. More Production Per Plant.
  • Get Your Weight - Accelerated Growth Rates. Cut Veg Times. Heavy Yields = Heavy Profits.
  • Take A Vacation - Easy and Reliable. No Timers. No Guesswork. Reduced Labor & Maintenance.
  • Top-Shelf Results - Optimal Resin Output. Strong Terpene Profiles. Tests Clean.
  • Facility Proven - Ideal for Craft Cultivation. Trusted by Professional Growers Worldwide.


  • 9XL: 1.59m x 2.45m
  • 12XL: 1.59m x 3.09m
  • 18XL: 1.59 x 4,36m
  • 24XM: 1.59 x 5.63m

Learn more at the Current Culture website here.

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