Thompson Strainer for Cooling Tower and Chiller Water applications (full flow and sidestream). The strainers are available with a wide variety of screen mesh options, ranging from large perforated hole-openings down to approximately 50-micron. Filtroil Filtration System Extends the life of your hydraulic fluids. Drastically reduces waste oil disposal costs. Reduces machine hydraulic repairs 25 to 35%. Cools and cleans oil system giving smooth machine operation. Helix Screen/Disk Water Filters Miller Leaman Helix Screen/Disk Water Filters are available in three different sized models: 2", 2" Super and 3".