How to Convert a Sprayer for Biological Farming

Can you spray biologicals without buying an expensive purpose-built machine? In this video, Graeme from Biolink shows how an old herbicide sprayer was converted into a dedicated biological spraying unit for less than $10,000.

We take a detailed look inside a modified 800-litre sprayer, covering the pump, plumbing, mixing system, safety upgrades, flood jet selection, and practical changes that make biological applications more accessible for everyday farmers.

Whether you’re applying compost extracts, biological fertilisers, fish hydrolysate, blood and bone products, or other regenerative agriculture inputs, this walkthrough demonstrates how existing equipment can often be adapted rather than replaced.

You’ll learn:
• How a hydraulic-driven pump improves mixing performance
• Why large-volume plumbing matters for biological products
• How to reduce blockages when spraying organic inputs
• Safety advantages over traditional PTO-driven systems
• How farmers can build a biological sprayer without spending a fortune

This video is ideal for farmers, graziers, regenerative agriculture practitioners, broadacre operators, horticultural producers, and anyone interested in practical biological farming systems.

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00:00 Why Convert an Old Sprayer?
00:20 Inside the Biological Sprayer Build
00:46 The High-Volume Mixing Pump Explained
01:17 Plumbing Modifications That Improve Mixing
01:48 How the Spray System Operates
02:10 Choosing the Right Flood Jet
02:35 Adjusting Application Rates
02:42 Simple Improvements for Easier Filling
03:00 Fast Tank Filling System
03:17 Why Hydraulic Drive Is Safer Than PTO
03:40 Build a Biological Sprayer for Under $10,000

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