I'm in the market for one, having outgrown my one-gallon pump-spray-pumpsomemore applicators. Problem is, there are too many choices, so I would like to hear your opinions about 3-4 gallon backpak sprayers. The sprayer will be used to apply fungicide, pesticide, and foliar feedings to a 500 ft² veg garden, foundation landscape plantings, and a few dwarf fruit trees.
Piston or diaphram pump? Best PSI? Brass for wand and/or nozzle or will poly suffice? Lumbar support and strap comfort? Durability? Leaks? Solo, Field King, Gilmore, SP Systems, or Hudson?
TIA