The Add Back Kit (ABK) provides a simple approach to adding concentrated fertilizers or pH adjusters directly into your Under Current® system. 

The Add Back Kit utilizes a patented Mazzei injector to pull concentrates directly into the system’s solution. The Add Back Kit uses the Under Current® system’s existing water pump and flow to naturally draw nutrients into the system via venturi action. 

Easily Add Back Nutrients and pH Adjustors to Your System Avoid Shocking Plants During pH and Nutrient Adjusting Simple process, Just Turn a Valve to Initiate Add Back Adapts to any Under Current® System Can Also Be Used for Supplemental Aeration Safe and simple.

Avoid Shocking Plants During pH and Nutrient A

• Easily Add Back Nutrients and pH Adjustors to Your System
• Avoid Shocking Plants During pH and Nutrient Adjusting
• Simple process, Just Turn a Valve to Initiate Add Back
• Adapts to any Under Current® System
• Can Also Be Used for Supplemental Aeration
• Safe and simple.