Stainless steel is the best material and can be fixed with hose-end caps to facilitate flushing and drainage. The amount of flow required for sufficient agitation depends on the chemical formulation. For example, wettable powders require more agitation than emulsifiable concentrates to keep them in suspension. Applications that require vigorous agitation may need mechanical agitation such as propellers or paddles on a rotating shaft. For most spraying situations, hydraulic agitation is sufficient.
Hydraulic agitation requires a portion of the flow from the pump to be diverted back to the tank.
The amount of flow for agitation will depend on chemical formulation, tank size and shape. Usually use 5 to 10 percent of the tank's capacity for agitation flow. Siphon caps can be used on jet agitators to reduce flow requirements by half. Siphon caps increase the flow by venturi action which increases the mixing potential. A feature shown in Figures 1 and 2 is a separate line and agitation valve for agitation.