Current Culture Under Current 8 Boneless

Current Culture Under Current 8 Boneless


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High Performance Deep Water Culture Hydroponics Systems


This is a Boneless system and does not come with any ABS piping to allow for custom spacing between modules.

Note: The Add-Back Kit is NO LONGER INCLUDED with any CCH2O UC Systems

Current Cultures' UC 8 is perfect for the grower that is looking for a 8-site deep water culture hydroponic system. With different growth module sizes, plant spacing, and lid options the under current can be configured in a number of ways. Depending on your configurations the UC 8 will have a footprint between 2ft 10.5in x 8ft 4.5in and 4ft 6in x 14ft 2.5in, and a total system volume of 63 gallons to 105 gallons. See our Add On Components for important tools that will maximize your garden's production and ensure its health. If you have any questions about this system give us a call and one of our experienced growers will answer all of your questions.

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.


Yield more with less reduce plant counts more production per plant


Accelerated growth rates cut veg times heavy yields = heavy profits


Easy and reliable no timers, no guesswork reduce labor & maintenance


Optimal Resin Output. Strong Terpene Profiles.


Ideal For Artisinal Batch Cultivation


Trusted By Professional Growers Worldwide

What is the Under Current System?

The Under Current system is the world’s only recirculating water culture hydroponic system to feature the patented Sub-Current Culture circulation method. The Under Current is cornerstone of the CCH2O Proven Production Approach when used with Cultured Solutions® Nutrients and the CCH2O Nutrient Dosing System.

Sub-Current Culture (SCC) technology utilizes negative water pressure to recirculate highly 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.

This 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.

Current Culture UC System

This System Includes

  • 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
  • High Flow Aeration Manifold
  • Air Pump Bank with CCH2O Air Flow Regulator
  • Premium Linear Air Pump(s)
  • Danner Mag-Drive Return Pump with 1″ Return Hose
  • CCH2O Sintered Air Stone
  • CCH2O Drain Out Kit
  • Adjustable Float Valve with Reservoir Adapter Kit
  • Cultured Solutions XS Growers Pack
  • 3-Year Limited Warranty.

Critical components of the Current Culture UC System

The best just got better! The Current Culture UC Systems now come with all of these compents included so you can worry less and harvest more!

  1. CCH2O Multi Mod
    • CCH2O Drop Tee
  2. UC Drain Out Kit
  3. High-flow Aeration Manifold
  4. Air Pump Bank with CCH2O Air Flow Regulator
  5. 5.5” CCH2O Lids & Net Pots
  6. 1" Return Hose & Bottom Drain Manifold

Below we will go into a little bit of detail on these critical components so you can learn the Current Culture UC System inside and out!

Current Culture System Parts Digram

1. CCH2O Multi Mod

The most versatile hydroponic growth module available

  • Exterior Water Level Marks
  • Recessed Drain Well for Full Drain Out
  • Greenhouse Grade Heavy-Duty Construction
  • Smooth Interior for Easy Cleaning
  • Raised Body for Thermal Cooking

The CCH2O Drop Tee work with the multi mod bottom drain design part of the drain out kit. The patent-pending design of the Drop Tee collects solution from the lowest point!

Current Culture Multi Mod

2. Drain Out Kit

Full system drain removes 100% of solution with an extremely fast flush and fill. The 1" hose connects to CCH2O Drop Tees for quick system evacuation.

3. High Flow Aeration Manifold

Pre-cut sections make installation easier

  • Even Distribution
  • More Air to Plants
  • Clean & Organized

4. Air Pump Bank with CCH2O Air Flow Regulator

Easily calibrate and standardize aeration rates. Measure the air volume in inches of water volume column witht he air flow regulator

5. CCH2O Lids & Net Pots

Less Media. Easily Transfer Plants from Veg to Bloom.

6. 1" Return Hose & Bottom Drain Manifold

  • More room between rows
  • High-flow circulation
  • Lower volume to prime pump

Wider center aisle on all Double Barrel Systems.

Return Hose & Bottom Drain Manifold

Additional Current Culture UC System Options

Boneless Option

Boneless Option

All Under Current systems are available in a "Boneless" option. Boneless systems ship WITHOUT straight sections of piping allowing for custom plant spacing.

Remote Epicenter Option

Remote Epicenter Option

All Under Current systems are available with a "Remote Epicenter" option. This allows growers to place the Epicenter (Control Module) on the outside of their grow space or tent

The Under Current Series

Under Current

1-2 Weeks Veg Time

8 Gallon

18" Spacing

2-3' Plants

Under Currnent XL

2-3 Weeks Veg Time

8 Gallon

25" Spacing

3-4' Plants

Under Currnent XL13

3-5 Weeks Veg Time

13 Gallon

30" Spacing

4-5' Plants

Under Currnent XXL13

4-6 Weeks Veg Time

13 Gallon

40" Spacing

5-6' Plants

Accessories for your Current Culture UC Hydroponic System

Grow confidently. With 10+ years of industry-leading innovation and results, we are the experts.

Cultured Solutions nutrients are the best way to provide balanced nutrion in your hydroponics system to maximize your plant's vigor. The proven approach to successfully growing hydroponically.

Cultured Solutions Nutrients

The following important tools will maximize your garden's production. Suggested products listed as add-ons at top of product page above.

Reverse Osmosis Water Filters

Water quality is of the utmost importance when growing in water culture. RO water allows growers to control all minerals and nutrients their plant's uptake. A reverse osmosis water filter is recommended for source waters exceeding 100 ppm.

Water Chillers

The highest levels of dissolved oxygen are only accessible with cool root zone temperatures. High water temperatures limit the solutions ability to hold dissolved oxygen, while also providing the ideal environment for dangerous pathogens. Water chillers ensure cool, consistent solution temperatures are provided to the root zone.

Meters & Testing

Utilizing metering equipment in your garden will offer precise monitoring over essential environmental factors such as pH, ppm/EC, temperature and humidity. When used in conjunction with dosing and controlling equipment, the Under Current has the potential to be completely automated.


Using a top-off reservoir will maintain accurate and essential solution levels throughout the course of the growing cycle, ensuring plants stay hydrated.

Current Culture has commercial cleaning products for both surface and air disinfection and sanitation.

Current Culture Air Sanitation

Indoor greenhouse air quality can have a huge impact on plant growth and final product yield. Humidity generated by the plant creates a perfect breeding environment for various airborne pathogens and fungal diseases like powdery mildew, downy mildew, and gray mold/botrytis. These microbes can easily spread throughout the greenhouse, putting your crops at constant risk. The best way to prevent an outbreak is to invest in air sanitation technology.

Current Culture Surface Sanitation

The Current Culture C1 Mobile Disinfection Cart is best when you require ozone disinfection in multiple locations within a facility, different buildings, larger facilities, or when you simply want the convenience of mobility. Professionals understand the benefits of ozone as a disinfection tool and a safe organic solution that can replace traditional or harsh chemicals. The Mobile Disinfection Cart uses ozone-enriched cold water supplied at the rate and concentration you desire.

Specification for the Current Culture UC8

Number of Rows2
Number of Sites8
Plant Spacing &
Module Size
18" Centers / 8 Gallon25" Centers / 8 Gallon30" Centers / 13 Gallon40" Centers / 13 Gallon
System Dimensions2’10.5″ x 8’4.5″ /
0.88m x 2.55m
3’2.5″ x 10’1.5″ /
0.98m x 3.09m
3’8″ x 11’8.5″ /
1.12m x 3.57m
4’6″ x 14’2.5″ /
1.37m x 4.33m
Total System Volume
(Reservoir) (gal/lt)
63 / 23865 / 246100 / 379105 / 398
Power Usage105 Watts155 Watts
Recommended Water Chiller (HP)1/4 HP1/4 - 1/2 HP

Other Current Culture UC options

Current Culture has a massive selection of complete hydroponic systems to choose from. You can view all the different categories of systems from the links below. If you need help finding the best system for your needs and requirements, give us a call and one of our awesome sales reps will be happy to assist you!


Current Culture Under Current 8 Boneless Videos

Product Q&A

Current Culture Under Current 8 Boneless Questions & Answers

General Recommendations

What are the most common mistakes made in water culture?
a. Running nutrient strength too high. This can inhibit water uptake and contribute to metabolic stagnation and subsequent plant stress.
b. Using incompatible inputs in solution causing convolution of the water chemistry. Avoiding organic, low solubility inputs is strongly recommended.
c. Micromanaging pH. Adjusting pH too frequently can lead to nutrient solution instability and issues.

What makes the Under Current a more efficient hydroponic method?
Less frequent nutrient change outs, lower nutrient usage rates, less pH fluctuations (less pH adjusters needed) and the conservation of precious H2O.

What makes the Under Current more productive compared to other hydroponic systems?
When a water culture system is operated properly, plants benefit from an increased uptake of water and minerals in solution as well as sustained cell turgidity. Given the favorable CEC of water, a plants nutrient uptake efficiency in water culture is very high, resulting in superior results.

Planning And Sizing

What is the approximate volume of solution in each module during standard operation?
a. 8 gallon – approx. 6 gallons
b. 13 gallon – approx. 10 gallons
c. 35 gallon – approx. 30 gallons

How do I calculate my total system volume?
a. Multiple total number of modules plus 1 (for Epicenter) multiplied by the approximate volume per module. Take this volume and add 10% to account for solution in joints and manifolds.
b. Example: UCDB16XL –
i. 17 x 6 gallons per module = 102 gallons
ii. 102 + 10% = 112 gallons

Can I integrate a nutrient auto dosing system?

What is a top-off reservoir and why do I need one?
A top-off reservoir is used to maintain consistent system volume and water chemistry. The top-off reservoir will supply solution via gravity to the float valve in Epicenter (control module).

Do I need a water chiller?

Do I need a Bulkhead Filter for each growth module?

Is there an option for custom system spacing?
Yes, all systems are available in a “Boneless” configuration without straight sections of pipe, allowing you to customize your plant centers.

Does a "Boneless" system include instructions on how to cut/couple pipe?
Yes, each “Boneless” kit includes a Boneless cut chart and recommendations for gluing and assembly.

Operating the Under Current

Should the Air Pump and Water Pump run 24/7?

Where should I set my solution level?
a. Initial Transplant: See diagram.
b. Veg: 2” above base of net pot.
c. Bloom: 1” below base of net pot

What should be in my top-off reservoir?
When operated properly, top off should be balanced the same or slightly higher as the solution in the system.

Does a top-off reservoir help maintain water chemistry (pH/EC) stability?
Yes. Any fluctuations in pH/EC can have a negative effect on plant health.

How do I adjust pH?
a. CAUTION: Do NOT add pH concentrate directly to Epicenter (control module).
b. If the pH is between 5.5-6.5 no adjustment is necessary.
c. Dilute pH adjuster 1:128 (about 1 oz. adjuster per gallon of fresh water). Once diluted slowly add to the system, allow 20-30 minutes for mixing. Re-test once pH has stabilized, add more diluted adjuster as necessary.

What solution temperatures are optimal?
We recommend maintaining a water temperature between 65-68 degrees F.

What solution temperatures are optimal?
We recommend maintaining a water temperature between 65-68 degrees F.

Do I need to include the initial PPM of my source-water when calculating nutrient levels?
Yes. Adjust accordingly.

Do I need to include the initial PPM of my source-water when calculating nutrient levels?
Yes. Adjust accordingly.

Do I have to empty out the entire system to do a nutrient change-out?

What do I use to clean the system? Mix Ratio of Cleaning Agent?
Physan 20, follow manufacturer’s directions.

Growing in the Under Current

How do you veg for the system?
a. Under Current system (8 gallons): Bare root or cube (rock wool, oasis, etc) propagated plants can be placed directly into our CCH2O Net Pot and placed directly into a Under Current system for optimum growth. This technique is perfect if subsequently transplanting into a larger Under Current system (13 gallon or 35 gallon PRO) at a wider plant spacing.
i. In this case, the entire CCH2O Lid (with Net Pot) can be picked up and moved directly to another Under Current growth module for flowering. This method is ideal for avoiding unnecessary root damage during transplant into bloom.
b. Ebb and Flow table (Periodic Flood): Bare root or cube (rock wool, oasis, etc) propagated plants can be placed directly into our CCH2O Net Pot or 4″/6″ rock wool cubes and placed in a typical tray. Some natural root pruning may occur as the roots grow through the net pot due to the intermittent watering cycle.
c. Ebb and Flow Table (Continuous Flood): Bare root or cube (rock wool, oasis, etc) propagated plants can be placed directly into our CCH2O Net Pot or 4″/6″ rock wool cubes and placed in a typical tray. Adding air diffuser to the tray will create a water culture environment. This will stimulate root growth similar to the Under Current system and prepare the plants for a fairly seamless transition.
d. Drip: Bare root or cube (rock wool, oasis, etc) propagated plants can be placed directly into our CCH2O Net Pot or 4″/6″ rock wool cubes. A drip system with emitters in each net pot/cube can be placed on a bench or in a flood tray. Some natural root pruning may occur as the roots grow through the RW cube.

What grow mediums are recommended for use in the Under Current?
a. Any non-wicking inert grow media tends to work best. Expanded clay pellets and growstones are some of the most popular.
b. When using a wicking media like rockwool be sure to adjust solution level to ¼” below contact with the R.W.

Nutrient Considerations

What is the best nutrient for the Under Current?
Pure mineral-salt based nutrients like Current Culture’s Cultured Solutions are the most compatible with actively aerated water culture.

What is the recommended nutrient strength for the Under Current?
a. Veg: 100-400 ppm / 0.2-0.8 EC
b. Bloom: 450-900 ppm / 0.9-1.3 EC
c. **Based on ppm 500 scale

Are carbohydrates/sweeteners, enzymes and beneficial bacteria recommended in the Under Current?
No. These tend to create bio-films and de-stabilize water chemistry.

Should I use Ca/Mg in the Under Current?
When using Reverse Osmosis (RO) or De-Ionized (DI) water Calcium Magnesium is recommended at 0.25-1mL per gallon. The Cultured Solution’s Coco Cal Supplement is your best choice.

Should I change my nutrient strength each week?
Follow manufacture’s nutrient schedule as recommended.

How frequently should I change my nutrients?
Change outs are recommended every 7 to 14 days, or if pH becomes de-stabilized (drifts more than 0.3 per day).

Do I need to flush my system between change-outs?
No, assuming only compatible inputs are being used a simple drain and refill is sufficient.

Is it possible to over-aerate my Under Current?
Yes, we recommend aeration levels stay between 0.75-1.5 liters per minute/per gallon. Exceeding these levels may cause mineral precipitation and nutrient de-stabilization.


What should I do if I make a mistake?
Observations and slight adjustments are the best way to dial your system in when in doubt give us or CCH2O a call.

Tech Specs