The WaterFarm 8-Pack Circulating Upgrade Kit contains everything needed to reconfigure your system to add nutrient circulation capability. 

How does it work? All the pieces and parts are included in General Hydroponic's Circulating Upgrade Kit to add a second flow-through port and tube for each pot. The additional pump then keeps the nutrient solution in constant circulation.

What will this do for you? Promote plant growth consistancy and improved health. The added circulation keeps the nutrients balanced throughout your WaterFarm 8-Pack system. In turn you'll see more consistant pH levels and the increased oxygenation that plants thrive on.

The constant water movement also prevents sediment buildup for healthier plant roots.

WaterFarm 8-Pack Circulating Upgrade Kit includes:

Blue Tubing - 1/2" x 9'
Circulating pumping column
Air Hose - 1/4" x 6'
Single Output Air Pump
9-1/2" Grommets
9-1/2" Straight Barbed Fitting
3-1/2" Elbow Barbed Fitting
Blue Tubing - 1/2" x 8"
13/16" Spade bit
1/4" Drill bit

More info (PDF format)