Current Culture Under Current Pro Evolution 24

Current Culture Under Current Pro Evolution 24


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High Performance Deep Water Culture Hydroponics Systems


The Under Current® PRO is a Greenhouse Grade Re-Circulating Water Culture System made specifically for Commercial Growers.

The re-designed Under Current PRO represents the largest, highest quality, most durable version of our Under Current system to-date. With high levels of aeration and circulation, nutrient efficiency is maximized and yields are expected to be off the charts.

The 35 gallon Under Current® PRO systems will function much like their 8 and 13 gallon counterparts but will feature several unique and up-sized heavy duty components. Every element of the system has been reinforced and maximized for longevity in adverse greenhouse-style conditions.

All PRO systems come standard in a “Boneless” configuration WITHOUT straight sections of 3” PVC to allow for custom plant spacing. The PRO Air Manifold also comes standard in a “Boneless” configuration WITHOUT straight sections of 1.5” PVC to allow for custom plant spacing.

All Current Culture UC PRO configurations are available with 1 lid option



Yeild more with less reduce plant counts more production per plant


Accelerated growth rates cut veg times heavy yeilds = heavy profits


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

Growing in the Under Current PRO

For commercial applications the Under Current® PRO triumphs in efficiency and yields. The PRO system offers growers the opportunity to fill very large spaces and grow massive plants without the extra work of managing multiple systems and reservoirs. Having fewer larger systems equals higher productivity in terms of workflow, transplanting, maintenance and harvesting.

The Under Current® PRO system would be best situated in either a greenhouse or indoors with a combination of vertical and horizontal lighting. The 35 gallon PRO growth module with single plant sites will be best utilized on 70”+ plant centers.

Starting plants in our 8-gallon Under Current® systems and transplanting them to the PRO module at a height of 3-4’ will yield a monstrous 8-10’+ finished plant when harvested.

For even more flexibility we offer interchangeable PRO Lids in 6-site configurations. These durable ABS lids increase the PRO system’s versatility and allow for tighter plant spacing, quicker turnaround times and Sea of Green (S.O.G) style cultivation methods.

Pro Mod with plant


Optimal Resin Output. Strong Terpene Profiles.


Ideal For Artisinal Batch Cultivation


Trusted By Professional Growers Worldwide

Current Culture Under Current PRO Systems Include:

  • CCH2O PRO 35 Gallon Heavy Duty ABS Growth Modules
  • CCH2O PRO Heavy Duty ABS Lids with Dual Portholes
  • CCH2O 5.5" Heavy Duty Lids with Port Hole
  • CCH2O 5.5" Heavy Duty Net Pots
  • 3” Manifold Fittings and 3” UC Spin-Tight Bulkheads
  • Premium Linear Air Pump or Regenerative Blower (16-site and above)
  • Aqua-Pore Pro XL Air Diffusers
  • PRO Air Distribution Manifold Fittings and PRO Air Tees
  • Quick Connect Air Hose
  • In-Line Filter(s)
  • Premium Mag-Drive Return Pum
  • Adjustable Float Valve with Reservoir Adapter Kit
  • Drain Valve, Chiller Adapter
  • Garden Hose Drain Adapter
  • Cultured Solutions VEG A/B
  • 1-Year Warranty

Greenhouse Grade PRO Components

PRO Growth Module: The reinforced solid ABS PRO Growth Module features water level indicators, recessed bulkhead coves, easy drain bottom, recessed drain valve cove and custom inlets for our float valve and water inlet tee. Made in California

PRO Growth Module

PRO Lids: The reinforced solid ABS PRO Lid allows growers to easily transfer plants from our 8 or 13 gallon systems by simply moving our standard CCH2O Lid and CCH2O Net Pot intact. The PRO Lid will also be available in a 6-site version for tighter plant spacing and Sea of Green cultivation. All PRO Lids incorporate dual port-hole access points and air inlet coves. Made In California.


Aqua-Pore PRO XL Air Diffusers: All PRO systems come standard with our new Aqua-Pore PRO XL Air Diffusers. Aqua-Pore Pro Diffusers have low back pressure creating significantly higher oxygen transfer rates and higher dissolved oxygen (DO) levels. The membrane’s tiny pore size creates extremely small diameter bubbles. These new diffusers are more durable, have a long-life, require low-maintenance and feature a quick connect fitting for easy installation.

Aqua-Pore PRO XL Air Diffuser

PRO Air Delivery System: The PRO Air Delivery system will include the highest quality linear air pump or commercial regenerative blower (16-site and above). It will come standard with up-sized, quick-connect air manifold fittings and premium quality air hose.

PRO Air Delivery System

Accessories for your Current Culture UC Hydroponic System

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

Culture 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.

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 Pro Evolution 24 Videos

Product Q&A

Current Culture Under Current Pro Evolution 24 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