Hi Allan I have been using a very simple and cheap venturi injecter pump called a Mazzei Injector."It is a high efficiency venturi type,differentail pressure injector.It has a patent design that permits them to start suction in most models when the outlet pressure is only 20% less than the inlet pressure" 50% pressure differencial is the optimum working level. It works very effectivly using T tape trickle irrigation. The smallest set up is 4 x 50m beds with 2 lines per bed ie 400 linear metres of T tape I also use on an overhead irrigation system at a different setting. When i had to replace an old proportionater pump it was going to cost $1200NZ. The Mazzei injector cost $140 and does the same job. The model i use covers 2 acres.
Mazzei Injector Corporation 11101 Mountain Road,R5. Bakersfield, California 93307 USA PHone (805)845-2253 Fax (805)845-3302 Cheers Tony Robinson NEw Zealand
