The individual selection of a Muscle Coalescer depends upon application factors such as: Chip removal requirements (removal of suspended and floating chips or swarf) Metal chips chemically degrade coolant, so they are best removed, whenever possible. The smaller the chip size, the quicker this degradation takes place, so in grinding or cast iron machining, chip removal is definitely recommended. Choose the Deluxe w/Filter model whenever chip removal is of interest. Select the filter bag with a pore size relative to that of the chip size. Type of coolant (full-synthetic, semi-synthetic or water-soluble oil) For full synthetics, the Plus model is recommended. For semi-synthetics and water soluble oils, the Deluxe model is best due to the additional coalescing media which helps separate the tramp oil from the base oil. Intake attachment selection will be based upon sump factors such as access to the area where installed, fluid level fluctuations, and surface debris. A dedicated Muscle is best for each sump that sits idle more than one shift. Idle sumps biologically degrade more quickly than those that circulate. The Z17 Muscle Coalescer will remove the tramp oils and also continuously aerate and circulate the sump, preventing bacterial rancidity.