Under Current Systems & Parts

The Under Current system is the world’s only recirculating water culture hydroponic system to feature the patented Sub-Current Culture circulation method. 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 nutrient circulation ensures pH and EC levels are uniform throughout the entire system.

The 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.

Looking for Cultured Solutions nutrients for your Under Current System? Click here.

1 - 60 of 77 items
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Under Current 4 Under Current 4XL Under Current 4XL13
Under Current 4Under Current 4XLUnder Current 4XL13

4 plant recirculating deep water culture system. 18" plant spacing, 2 rows, 8 gallon modules.

4 plant recirculating deep water culture system. 25" plant spacing, 2 rows, 8 gallon modules.

4 plant recirculating deep water culture system. 30" plant spacing, 2 rows, 13 gallon modules.

$1,079.95

$949.99

$1,094.95

$979.99

$1,289.95

$1,159.99

Under Current 4XXL13 Under Current 6 Under Current 6XL
Under Current 4XXL13Under Current 6Under Current 6XL

4 plant recirculating deep water culture system. 40" plant spacing, 2 rows, 13 gallon modules.

6 plant recirculating deep water culture system. 18" plant spacing, 2 rows, 8 gallon modules.

6 plant recirculating deep water culture system. 25" plant spacing, 2 rows, 8 gallon modules.

$1,299.95

$1,159.99

$1,124.95

$999.99

$1,269.95

$1,129.99

Under Current 6XL13 Under Current 6XXL13 Under Current 8
Under Current 6XL13Under Current 6XXL13Under Current 8

6 plant recirculating deep water culture system. 30" plant spacing, 2 rows, 13 gallon modules.

6 plant recirculating deep water culture system. 40" plant spacing, 2 rows, 13 gallon modules.

8 plant recirculating deep water culture system. 18" plant spacing, 2 rows, 8 gallon modules.

$1,554.95

$1,379.99

$1,584.95

$1,419.99

$1,469.95

$1,309.99

Under Current 8XL Under Current 8XL13 Under Current 8XXL13
Under Current 8XLUnder Current 8XL13Under Current 8XXL13

8 plant recirculating deep water culture system. 25" plant spacing, 2 rows, 8 gallon modules.

8 plant recirculating deep water culture system. 30" plant spacing, 2 rows, 13 gallon modules.

8 plant recirculating deep water culture system. 40" plant spacing, 2 rows, 13 gallon modules.

$1,484.95

$1,329.99

$1,834.95

$1,639.99

$1,864.95

$1,659.99

Under Current Evolution 9 Under Current Evolution 9XL Under Current Evolution 9XL13
Under Current Evolution 9Under Current Evolution 9XLUnder Current Evolution 9XL13

9 plant recirculating deep water culture system. 18" plant spacing, 3 rows, 8 gallon modules.

9 plant recirculating deep water culture system. 25" plant spacing, 3 rows, 8 gallon modules.

9 plant recirculating deep water culture system. 30" plant spacing, 3 rows, 13 gallon modules.

$1,769.95

$1,589.99

This item ships freight.

$1,786.95

$1,599.99

This item ships freight.

$2,129.95

$1,899.99

This item ships freight.

Under Current Evolution 9XXL13 Under Current 12 Under Current 12XL
Under Current Evolution 9XXL13Under Current 12Under Current 12XL

9 plant recirculating deep water culture system. 40" plant spacing, 3 rows, 13 gallon modules.

12 plant recirculating deep water culture system. 18" plant spacing, 2 rows, 8 gallon modules.

12 plant recirculating deep water culture system. 25" plant spacing, 2 rows, 8 gallon modules.

$2,159.95

$1,899.99

This item ships freight.

$1,869.95

$1,619.99

$1,899.95

$1,699.99

Under Current 12XL13 Under Current 12XXL13 Under Current Evolution 12
Under Current 12XL13Under Current 12XXL13Under Current Evolution 12

12 plant recirculating deep water culture system. 30" plant spacing, 2 rows, 13 gallon modules.

12 plant recirculating deep water culture system. 40" plant spacing, 2 rows, 13 gallon modules.

12 plant recirculating deep water culture system. 18" plant spacing, 3 rows, 8 gallon modules.

$2,454.95

$2,199.99

$2,499.95

$2,219.99

$2,014.95

$1,799.99

This item ships freight.

Under Current Evolution 12XL Under Current Evolution 12XL13 Under Current Evolution 12XXL13
Under Current Evolution 12XLUnder Current Evolution 12XL13Under Current Evolution 12XXL13

12 plant recirculating deep water culture system. 25" plant spacing, 3 rows, 8 gallon modules.

12 plant recirculating deep water culture system. 30" plant spacing, 3 rows, 13 gallon modules.

12 plant recirculating deep water culture system. 40" plant spacing, 3 rows, 13 gallon modules.

$2,047.95

$1,799.99

This item ships freight.

$2,634.95

$2,319.99

This item ships freight.

$2,679.95

$2,399.99

This item ships freight.

Under Current 16 Under Current 16XL Under Current 16XL13
Under Current 16Under Current 16XLUnder Current 16XL13

16 plant recirculating deep water culture system. 18" plant spacing, 2 rows, 8 gallon modules.

16 plant recirculating deep water culture system. 25" plant spacing, 2 rows, 8 gallon modules.

16 plant recirculating deep water culture system. 30" plant spacing, 2 rows, 13 gallon modules.

$2,317.95

$2,019.99

$2,359.95

$2,099.99

$3,044.95

$2,729.99

Under Current 16XXL13 Under Current Double Barrel 16 Under Current Double Barrel 16XL
Under Current 16XXL13Under Current Double Barrel 16Under Current Double Barrel 16XL

16 plant recirculating deep water culture system. 40" plant spacing, 2 rows, 13 gallon modules.

16 plant recirculating deep water culture system. 18" plant spacing, 4 rows, 8 gallon modules.

16 plant recirculating deep water culture system. 25" plant spacing, 4 rows, 8 gallon modules.

$3,164.95

$2,829.99

$2,549.95

$2,279.99

This item ships freight.

$2,584.95

$2,299.99

This item ships freight.

Under Current Double Barrel 16XL13 Under Current Evolution 18 Under Current Evolution 18XL
Under Current Double Barrel 16XL13Under Current Evolution 18Under Current Evolution 18XL

16 plant recirculating deep water culture system. 30" plant spacing, 4 rows, 13 gallon modules.

18 plant recirculating deep water culture system. 18" plant spacing, 3 rows, 8 gallon modules.

18 plant recirculating deep water culture system. 25" plant spacing, 3 rows, 8 gallon modules.

$3,314.95

$2,949.99

This item ships freight.

$2,719.95

$2,419.99

This item ships freight.

$2,767.95

$2,449.99

This item ships freight.

Under Current Evolution 18XL13 Under Current Evolution 18XXL13 Under Current Double Barrel 24
Under Current Evolution 18XL13Under Current Evolution 18XXL13Under Current Double Barrel 24

18 plant recirculating deep water culture system. 30" plant spacing, 3 rows, 13 gallon modules.

18 plant recirculating deep water culture system. 40" plant spacing, 3 rows, 13 gallon modules.

24 plant recirculating deep water culture system. 18" plant spacing, 4 rows, 8 gallon modules.

$3,524.95

$3,169.99

This item ships freight.

$3,599.95

$3,229.99

This item ships freight.

$3,439.95

$3,079.99

This item ships freight.

Under Current Double Barrel 24XL Under Current Double Barrel 24XL13 Under Current Evolution 24
Under Current Double Barrel 24XLUnder Current Double Barrel 24XL13Under Current Evolution 24

24 plant recirculating deep water culture system. 25" plant spacing, 4 rows, 8 gallon modules.

24 plant recirculating deep water culture system. 30" plant spacing, 4 rows, 13 gallon modules.

24 plant recirculating deep water culture system. 18" plant spacing, 3 rows, 8 gallon modules.

$3,495.95

$3,129.99

This item ships freight.

$4,664.95

$4,189.99

This item ships freight.

$3,354.95

$2,999.99

This item ships freight.

Under Current Evolution 24XL Under Current Evolution 24XL13 Under Current Evolution 24XXL13
Under Current Evolution 24XLUnder Current Evolution 24XL13Under Current Evolution 24XXL13

24 plant recirculating deep water culture system. 25" plant spacing, 3 rows, 8 gallon modules.

24 plant recirculating deep water culture system. 30" plant spacing, 3 rows, 13 gallon modules.

24 plant recirculating deep water culture system. 40" plant spacing, 3 rows, 13 gallon modules.

$3,469.95

$3,119.99

This item ships freight.

$4,634.95

$4,149.99

This item ships freight.

$4,819.95

$4,329.99

This item ships freight.

Under Current Double Barrel 32 Under Current Double Barrel 32XL Under Current Double Barrel 32XL13
Under Current Double Barrel 32Under Current Double Barrel 32XLUnder Current Double Barrel 32XL13

32 plant recirculating deep water culture system. 18" plant spacing, 4 rows, 8 gallon modules.

32 plant recirculating deep water culture system. 25" plant spacing, 4 rows, 8 gallon modules.

32 plant recirculating deep water culture system. 30" plant spacing, 4 rows, 13 gallon modules.

$4,289.95

$3,849.99

This item ships freight.

$4,359.95

$3,919.99

This item ships freight.

$5,819.95

$5,229.99

This item ships freight.

Under Current PRO 4 Under Current PRO 6 Under Current PRO 8
Under Current PRO 4Under Current PRO 6Under Current PRO 8

4 plant recirculating deep water culture system. Variable plant spacing, 2 rows, 35 gallon modules. For GIGANTIC plants!

6 plant recirculating deep water culture system. Variable plant spacing, 2 rows, 35 gallon modules. For GIGANTIC plants!

8 plant recirculating deep water culture system. Variable plant spacing, 2 rows, 35 gallon modules. For GIGANTIC plants!

$2,999.95

$2,689.99

This item ships freight.

$3,769.95

$3,379.99

This item ships freight.

$5,189.95

$4,669.99

This item ships freight.

Under Current PRO 12 Under Current PRO 16 Under Current Spin Tight Bulkhead 2"
Under Current PRO 12Under Current PRO 16Under Current Spin Tight Bulkhead 2"

12 plant recirculating deep water culture system. Variable plant spacing, 2 rows, 35 gallon modules. For GIGANTIC plants!

16 plant recirculating deep water culture system. Variable plant spacing, 2 rows, 35 gallon modules. For GIGANTIC plants!

Easy to install; comes with rubber gaskets.

$6,619.95

$5,889.99

This item ships freight.

$7,584.95

$6,819.99

This item ships freight.

$13.50

Under Current Spin Tight Bulkhead 3" Under Current Bulkhead Wrench Cool Coil SS System Chiller
Under Current Spin Tight Bulkhead 3"Under Current Bulkhead WrenchCool Coil SS System Chiller

Easy to install; comes with rubber gaskets.

For use with Under Current Spin Tight Bulkheads.

Submersible cooling coil. For use with a chiller.

$14.50

$6.95

$149.95

Float Valve Kit With Reservoir Adapter Float Valve Kit 3/4" Drain Valve Kit
Float Valve Kit With Reservoir AdapterFloat Valve Kit3/4" Drain Valve Kit

Everything you need to start automatically topping off.

Adjustable PVC float valve

Provides a convenient drain outlet with standard garden hose threads.

$37.95

$24.95

$9.95

Reservoir Adapter Kit In-Line Filter Module Cage
Reservoir Adapter KitIn-Line FilterModule Cage

Designed to connect a reservoir to a float valve.

Keeps roots and debris from entering pumps.

48" support option for large plants. Works with 8 and 13 gallon Under Current modules.

$14.95

$21.95

$26.95

1 - 60 of 77 items