--- title: Donaldson Hy-Pro Lube & Hydraulic Filtration Industry Blog | dirt description: dirt | Learn about hydraulic fluid, lube oil, diesel fuel and industrial fluid contamination, filtration and conditioning on the Donaldson Hy-Pro blog. --- [![Donaldson Hy-Pro Logo_White](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo_White.png?width=591&height=265&name=Donaldson%20Hy-Pro%20Logo_White.png) ![Donaldson Hy-Pro Logo 2](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png?width=584&height=262&name=Donaldson%20Hy-Pro%20Logo%202.png) ](https://www.hyprofiltration.com) [**](https://www.hyprofiltration.com/blog/topic/dirt#tmpmodule_1568675152246189) [![Distributors](https://no-cache.hubspot.com/cta/default/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4) ![ECATALOG](https://no-cache.hubspot.com/cta/default/170326/interactive-162302555948.png) ** ###### 6 min read ### [How Dirt Makes Dirt: The Hidden Cost of Particulate Contamination](https://www.hyprofiltration.com/blog/dirtmakesdirt) By [Donaldson Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/donaldson-hy-pro-marketing) on Wed, Apr. 16, 2025 [![](https://www.hyprofiltration.com/hubfs/Dirt%20Makes%20Dirt%20Blog%20(300%20x%20175%20px).png) ](https://www.hyprofiltration.com/blog/dirtmakesdirt) ###### Topics: [dirt](https://www.hyprofiltration.com/blog/topic/dirt) [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [cleanoil](https://www.hyprofiltration.com/blog/topic/cleanoil) ###### 1 min read ### [Hy-Pro's Product Spotlight: Compact Offline Filter (COF)](https://www.hyprofiltration.com/blog/productspotlight-cof) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Apr. 01, 2021 # Hy-Pro's Compact Offline Filter Our newest and smallest unit yet, the Compact Offline Filter is able[![COF_Group-2](https://www.hyprofiltration.com/hs-fs/hubfs/COF_Group-2.jpg?width=201&name=COF_Group-2.jpg)](https://www.hyprofiltration.com/products/fluid-conditioning-equipment/offline-filter-system/cof-overview-0) to fit where no other filtration equipment can. Ideal for smaller systems or where a larger offline system wouldn't fit, this solution can be permanently installed or made portable for ease of use.  ###### Topics: [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [dirt](https://www.hyprofiltration.com/blog/topic/dirt) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [hydraulic filters](https://www.hyprofiltration.com/blog/topic/hydraulic-filters) [hydraulic and lubrication filter types](https://www.hyprofiltration.com/blog/topic/hydraulic-and-lubrication-filter-types) [Gearbox filtration](https://www.hyprofiltration.com/blog/topic/gearbox-filtration) [new oil](https://www.hyprofiltration.com/blog/topic/new-oil) [micro-dieseling](https://www.hyprofiltration.com/blog/topic/micro-dieseling) [fluid samples](https://www.hyprofiltration.com/blog/topic/fluid-samples) [filtration](https://www.hyprofiltration.com/blog/topic/filtration) [oil analysis](https://www.hyprofiltration.com/blog/topic/oil-analysis) [hydraulic pump](https://www.hyprofiltration.com/blog/topic/hydraulic-pump) [filters](https://www.hyprofiltration.com/blog/topic/filters) [hydraulic valve](https://www.hyprofiltration.com/blog/topic/hydraulic-valve) [FSL](https://www.hyprofiltration.com/blog/topic/fsl) [liquid conditioning station](https://www.hyprofiltration.com/blog/topic/liquid-conditioning-station) [duplex low-pressure](https://www.hyprofiltration.com/blog/topic/duplex-low-pressure) [oxidation](https://www.hyprofiltration.com/blog/topic/oxidation) [Noria](https://www.hyprofiltration.com/blog/topic/noria) [NSD](https://www.hyprofiltration.com/blog/topic/nsd) [hydraulic](https://www.hyprofiltration.com/blog/topic/hydraulic) [cellulose media](https://www.hyprofiltration.com/blog/topic/cellulose-media) [compressor](https://www.hyprofiltration.com/blog/topic/compressor) [Reliable Plant](https://www.hyprofiltration.com/blog/topic/reliable-plant) [filter comparison](https://www.hyprofiltration.com/blog/topic/filter-comparison) [lube oil](https://www.hyprofiltration.com/blog/topic/lube-oil) [aluminum refinery](https://www.hyprofiltration.com/blog/topic/aluminum-refinery) [conditioning](https://www.hyprofiltration.com/blog/topic/conditioning) [turbine oil](https://www.hyprofiltration.com/blog/topic/turbine-oil) [glass media](https://www.hyprofiltration.com/blog/topic/glass-media) ###### 3 min read ### [Getting to Know Demulsibility](https://www.hyprofiltration.com/blog/getting-to-know-demulsibility) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Mar. 25, 2021 # Demulsibility ## What is Demulsibility? Demulsibility is the ability of oil to separate from water. Oil and water naturally separate because like molecules attract each other. Oil sticks with oil, water sticks with water. Oil is "hydrophobic", or "afraid of water," which is a benefit when it comes to fluids like turbine oil.  ###### Topics: [varnish in hydraulic oil](https://www.hyprofiltration.com/blog/topic/varnish-in-hydraulic-oil) [varnish in turbine oil](https://www.hyprofiltration.com/blog/topic/varnish-in-turbine-oil) [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [water in oil](https://www.hyprofiltration.com/blog/topic/water-in-oil) [dirt](https://www.hyprofiltration.com/blog/topic/dirt) [Phosphate Ester](https://www.hyprofiltration.com/blog/topic/phosphate-ester) [diesel engine](https://www.hyprofiltration.com/blog/topic/diesel-engine) [maintenance](https://www.hyprofiltration.com/blog/topic/maintenance) [steel mills](https://www.hyprofiltration.com/blog/topic/steel-mills) [vacuum dehydration](https://www.hyprofiltration.com/blog/topic/vacuum-dehydration) [rolling mill lubricating oil](https://www.hyprofiltration.com/blog/topic/rolling-mill-lubricating-oil) [filter housing sizing](https://www.hyprofiltration.com/blog/topic/filter-housing-sizing) [micro-dieseling](https://www.hyprofiltration.com/blog/topic/micro-dieseling) [thermal event](https://www.hyprofiltration.com/blog/topic/thermal-event) [ISO 4406](https://www.hyprofiltration.com/blog/topic/iso-4406) [vacuum dehydrator](https://www.hyprofiltration.com/blog/topic/vacuum-dehydrator) [fluid samples](https://www.hyprofiltration.com/blog/topic/fluid-samples) [oil analysis](https://www.hyprofiltration.com/blog/topic/oil-analysis) [metal analysis](https://www.hyprofiltration.com/blog/topic/metal-analysis) [paper mill](https://www.hyprofiltration.com/blog/topic/paper-mill) [hydraulic pump](https://www.hyprofiltration.com/blog/topic/hydraulic-pump) [samples](https://www.hyprofiltration.com/blog/topic/samples) [COD](https://www.hyprofiltration.com/blog/topic/cod) [duplex low-pressure](https://www.hyprofiltration.com/blog/topic/duplex-low-pressure) [gearbox](https://www.hyprofiltration.com/blog/topic/gearbox) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) [hydraulic](https://www.hyprofiltration.com/blog/topic/hydraulic) [duplex high-pressure](https://www.hyprofiltration.com/blog/topic/duplex-high-pressure) [cellulose media](https://www.hyprofiltration.com/blog/topic/cellulose-media) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [filter comparison](https://www.hyprofiltration.com/blog/topic/filter-comparison) [aluminum refinery](https://www.hyprofiltration.com/blog/topic/aluminum-refinery) [lab](https://www.hyprofiltration.com/blog/topic/lab) ###### 4 min read ### [Fluid Life Extension](https://www.hyprofiltration.com/blog/fluid-life-extension) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Mar. 11, 2021 # Extending Fluid Life Saves Money and Helps the Environment Our mission is to make our customers as efficient as possible, and we achieve that with the highest quality filtration products and total system cleanliness strategies to maximize uptime, productivity and prevent costly fluid contamination related failures. Been there. Done that. Going to do it again tomorrow. But that's not the only way we make our customers efficient. Extending the useful life of in-service fluids pays big dividends in reliability, saves money on premature fluid replacement costs, and reduces the environmental impact of industry by reducing the amount of fluids used and discarded. Enhancing reliability, saving money, and protecting the environment are not only good business, they're our responsibility. To help reduce oil usage, let's first understand why fluids are condemned and prematurely replaced.  ###### Topics: [varnish in hydraulic oil](https://www.hyprofiltration.com/blog/topic/varnish-in-hydraulic-oil) [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [dirt](https://www.hyprofiltration.com/blog/topic/dirt) [vacuum dehydration](https://www.hyprofiltration.com/blog/topic/vacuum-dehydration) [filter housing sizing](https://www.hyprofiltration.com/blog/topic/filter-housing-sizing) [oil darkening](https://www.hyprofiltration.com/blog/topic/oil-darkening) [mining](https://www.hyprofiltration.com/blog/topic/mining) [fluid samples](https://www.hyprofiltration.com/blog/topic/fluid-samples) [oil analysis](https://www.hyprofiltration.com/blog/topic/oil-analysis) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [paper mill](https://www.hyprofiltration.com/blog/topic/paper-mill) [fluid transfer](https://www.hyprofiltration.com/blog/topic/fluid-transfer) [filters](https://www.hyprofiltration.com/blog/topic/filters) [filter cart](https://www.hyprofiltration.com/blog/topic/filter-cart) [gearbox](https://www.hyprofiltration.com/blog/topic/gearbox) [LCS](https://www.hyprofiltration.com/blog/topic/lcs) [duplex high-pressure](https://www.hyprofiltration.com/blog/topic/duplex-high-pressure) [indianapolis](https://www.hyprofiltration.com/blog/topic/indianapolis) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [lube oil](https://www.hyprofiltration.com/blog/topic/lube-oil) [turbine oil](https://www.hyprofiltration.com/blog/topic/turbine-oil) [desiccant](https://www.hyprofiltration.com/blog/topic/desiccant) [demulsibility](https://www.hyprofiltration.com/blog/topic/demulsibility) ###### 3 min read ### [Understanding ISO Codes](https://www.hyprofiltration.com/blog/understanding-iso-codes) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Feb. 25, 2021 # ISO Cleanliness Codes Explained The ISO Cleanliness Code (per ISO4406-1999) is used to quantify particulate contamination levels per milliliter of fluid at 3 sizes - 4µ, 6µ, and 14µ. It is expressed in 3 numbers (example 19/17/14) where each number represents a contaminant level code for the correlating particle size. The code includes all particles of the specified size and larger. For a detailed breakdown and a handy ISO code cheat sheet, see our [ISO Code Guide & Cheat Sheet](https://www.hyprofiltration.com/blog/iso-4406-cleanliness-codes)![Example of an ISO cleanliness code showing particle counts in hydraulic fluid at 4, 6, and 14 micron sizes.](https://www.hyprofiltration.com/hs-fs/hubfs/Screen%20Shot%202021-02-23%20at%202.50.37%20PM.png?width=283&name=Screen%20Shot%202021-02-23%20at%202.50.37%20PM.png)It is important to note that each time a code increases, the quantity range of particles is doubling. Inversely, as a code decreases by one the contaminant level is cut in half.  ###### Topics: [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [dirt](https://www.hyprofiltration.com/blog/topic/dirt) [hydraulic filters](https://www.hyprofiltration.com/blog/topic/hydraulic-filters) [Gearbox filtration](https://www.hyprofiltration.com/blog/topic/gearbox-filtration) [vacuum dehydration](https://www.hyprofiltration.com/blog/topic/vacuum-dehydration) [filter housing sizing](https://www.hyprofiltration.com/blog/topic/filter-housing-sizing) [plastic injection molding manufacturer](https://www.hyprofiltration.com/blog/topic/plastic-injection-molding-manufacturer) [oil darkening](https://www.hyprofiltration.com/blog/topic/oil-darkening) [mining](https://www.hyprofiltration.com/blog/topic/mining) [fluid samples](https://www.hyprofiltration.com/blog/topic/fluid-samples) [total systems cleanliness](https://www.hyprofiltration.com/blog/topic/total-systems-cleanliness) [metal analysis](https://www.hyprofiltration.com/blog/topic/metal-analysis) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [paper mill](https://www.hyprofiltration.com/blog/topic/paper-mill) [fluid transfer](https://www.hyprofiltration.com/blog/topic/fluid-transfer) [filters](https://www.hyprofiltration.com/blog/topic/filters) [hydraulic valve](https://www.hyprofiltration.com/blog/topic/hydraulic-valve) [coalesce technology](https://www.hyprofiltration.com/blog/topic/coalesce-technology) [filter cart](https://www.hyprofiltration.com/blog/topic/filter-cart) [cleanliness](https://www.hyprofiltration.com/blog/topic/cleanliness) [COD](https://www.hyprofiltration.com/blog/topic/cod) [hydraulic oil](https://www.hyprofiltration.com/blog/topic/hydraulic-oil) [gearbox](https://www.hyprofiltration.com/blog/topic/gearbox) [duplex high-pressure](https://www.hyprofiltration.com/blog/topic/duplex-high-pressure) [compressor](https://www.hyprofiltration.com/blog/topic/compressor) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [lube oil](https://www.hyprofiltration.com/blog/topic/lube-oil) [turbine oil](https://www.hyprofiltration.com/blog/topic/turbine-oil) [desiccant](https://www.hyprofiltration.com/blog/topic/desiccant) [demulsibility](https://www.hyprofiltration.com/blog/topic/demulsibility) [All posts](https://www.hyprofiltration.com/blog/all) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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