collection or disposal the liquid passing through screen 24 is collected in container 10 and withdrawn through outlet pipe 80 thus a simple rugged and easy to use separation unit is provided which will require a minimum of operating power and maintenance it was found that with a 48 34 o d 200 mesh size filter and under the conditions described above the capacity of the strainer was increased from 186 gpm using the arrangement described in u s pat no 4 412 920 to 360 gpm moreover while the prior art device could only be operated with a screen made of a 200 mesh filter media the vacuum strainer device described above could be used with 325 mesh filter media thereby reducing the size of the fines in the liquid considerably the fluid ejected from the nozzles 40 could be clean water however in many industrial applications recycled water is preferable for economical as well as environmental reasons of course recycled water may contain fines which may clog up the small sized orifice high pressure nozzles 40 therefore the nozzles must be purged at regular intervals to clear out any fines that have accumulated inside thereof a preferred nozzle 40 well suited for this purpose is shown in fig3 and 4 except as noted this nozzle 40 is similar to the nozzle disclosed in commonly assigned u s pat no 3 990 637 as shown in fig3 nozzle 40 has a generally tubular body member or casing 110 which is preferably formed of a metal such.