venturi-type injectors for injecting a fluid additive into a pressurized flowing stream of water in proportion to the rate of flow of the stream for the purpose of correcting an undesirable quality of the water such as by sanitizing it, or to improve a quality of the water, such as by the addition of fertilizers, insecticides or herbicides

'addit':9,55 'correct':31 'fertil':57 'flow':13,23 'fluid':8 'herbicid':60 'improv':45 'inject':6 'injector':4 'insecticid':58 'pressur':12 'proport':18 'purpos':29 'qualiti':34,47 'rate':21 'sanit':41 'stream':14,26 'type':3 'undesir':33 'venturi':2 'venturi-typ':1 'water':16,37,50

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