Stock Tanks & Agitators

At Zwart Systems, we offer a variety of greenhouse stock tank options and agitators to prevent your fertilizer from settling at the bottom of your stock tanks.

Stock Tanks & Agitators Nutrient Management at Zwart Systems | Greenhouse Irrigation & Automation Specialists, Beamsville, Ontario

Stock Tanks & Agitators

At Zwart Systems, we carry two types of stock tanks: fiberglass and poly. Constructed in a square (or rectangular) shape with rounded corners, fiberglass tanks are an easy to clean durable product. They are used to hold bulk stock solutions.

If you struggle with fertilizer mixtures settling to the bottom of your stock tanks and would like an automatic system, we have two solutions: our Air or Mechanical Agitators.

From the Ground Up

At Zwart Systems, we offer complete design, manufacturing, installation, and service of all our products. We can help create a system that's right for you.

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Stock Tanks & Agitators Overview

Stock Tanks

  • Stock Tank Overview

    Fiberglass tanks are available in 600, 1000, 2200, 3500, 4500 and 5500-litre capacities. All fiberglass tanks have an available lid option, and optional legs can be added to the tank.

    Poly tanks are designed for small batch mixing—these round tanks are semi-translucent allowing growers to see stock solution levels. Poly tanks are available in 12, 20, and 50-gallon capacities. All poly tanks come with lids. Add an optional agitator to automate mixing in your fertilizer solution and to maintain fertilizer suspension.

    Zwart recommends using lidded tanks to eliminate evaporation from the stock solution, as evaporation will unbalance fertilizer concentration. When running proportional injectors this is especially a concern because the dosing rate changes.

  • Fiberglass Stock Tanks
    • Available sizes (in litres): 600, 1000, 2200, 3500, 4500, 5500
    • Square or rectangular
    • *Optional lid (with or without hinge)
    • *Optional legs on all sizes
  • Poly Stock Tanks
    • 12, 20, and 50-gallon capacities
    • Round tank design
    • Semi-transparent


  • Options
    • Compressed air
    • Mechanical agitation
    • Programable intervals and run time
    • 110V power source required for agitator installations
  • Stock Tank Agitators

    Zwart Systems has come up with a simple solution to an age-old problem. How many farms have you been to and seen a boat paddle sticking out the stock tank? Perhaps yours is one of them! No need to be ashamed, the boat paddle works! If, however, you would like an automatic solution for fertilizer mixtures settling to the bottom of your stock tanks, give Zwart Systems a call. We have designed two simple solutions to make this tedious task an automatic one!

  • Air Agitation

    Using compressed air off your farm’s own standard air compressor and power from a 110V outlet, your manual paddle system can be replaced with an automatic stock tank agitator. This product is inexpensive when compared to mechanical mixers. It will not rust and there are no moving parts to maintain.

  • Mechanical Agitation

    Mechanical agitators utilize a ½ hp 115v motor lubricated with food-grade oil. This motor is stabilized by stainless steel frame construction and is fastened to the lid of the tank. The motor runs, slowly turning a stainless paddle to agitate tank solution, keeping it mixed and in suspension. This system easily adapts to any Zwart supplied stock tank.

Stock Tanks & Agitators Nutrient Management at Zwart Systems | Greenhouse Irrigation & Automation Specialists, Beamsville, Ontario


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