Current Culture H2O - Under Current UC4XL | DWC System | Complete Hydroponics

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What is the Under Current® System?

The Under Current® Recirculating Deep Water Culture (RDWC) System features the patented Sub-Current Culture® circulation method.  This high-performance water culture system is unmatched in efficiency, layout versatility and ease of use.  The Under Current® utilizes negative water pressure to recirculate oxygenated nutrient solution through the plant’s root zone ensuring pH and EC levels are uniform throughout the entire system.

The Under Current® is the cornerstone of the CCH2O Proven Production Approach when used with Cultured Solutions® Nutrients and the CCH2O Nutrient Dosing System.


Benefits of Growing in an Under Current®

  • 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.


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.

Under Current® System Features

Modular Design

  • Multiple growth module sizes and plant spacing options
  • Easy to set up, break down and expand
  • 60+ system configurations to suit any size plant and grow space
  • Designed to accommodate a wide variety of lighting footprints

Premium Construction

  • Highest quality commercial and greenhouse caliber components
  • Proprietary parts are designed and manufactured in California
  • Systems utilize professional grade air and water pumps


Under Current 4 XL

  • PLANT SPACING & MODULE SIZE: 25″ Centers / 8 Gallon


  • SYSTEM FOOTPRINT (FEET / METERS): 3’2.5" x 5’11.5" / 0.98m x 1.82m
  • WATER CHILLER SIZE* (HP): 1/10 – 1/6 HP
  • VEG TIME (WEEKS/IN.): 2-3 weeks / 18"-24"

*General Recommendation – Check Manufacturers Specifications for proper chiller sizing.


  • *NEW* CCH2O Multi Mod Growth Modules with Drain Well
  • CCH2O 5.5″ Heavy Duty White Lids with Port Hole
  • CCH2O 5.5″ Heavy Duty Net Pots
  • CCH2O Easy Clean Manifolds with UC Spin-Tight Bulkheads
  • *NEW* CCH2O Add-Back Kit
  • *NEW* High Flow Aeration Manifold
  • *NEW* Air Pump Bank with CCH2O Air Flow Regulator
  • Premium Linear Air Pump(s)
  • Danner Mag-Drive™ Return Pump with 1″ Return Hose
  • Drain Out Kit
  • Adjustable Float Valve with Reservoir Adapter Kit
  • Cultured Solutions™ XS Growers Pack
Current Culture H20 Under Current 4XL - Benchmark Bioponics