--- title: Donaldson Hy-Pro Lube & Hydraulic Filtration Industry Blog | cleanliness description: cleanliness | 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/cleanliness#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) ** ###### 2 min read ### [Factory Side Chat Podcast, Episode 9, Reducing the Total Cost of Ownership with a Kidney Loop or Offline Filtration unit](https://www.hyprofiltration.com/blog/factorysidechatepisode9-0) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Fri, Aug. 26, 2022 [![](https://www.hyprofiltration.com/hubfs/episdode%209%20factory%20side%20chat.png) ](https://www.hyprofiltration.com/blog/factorysidechatepisode9-0) ## Hy-Pro's Factoryside Chat is now available on Apple Podcasts, Spotify, Podbean, and YouTube. ###### Topics: [fluid cleanliness](https://www.hyprofiltration.com/blog/topic/fluid-cleanliness) [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [cleanliness](https://www.hyprofiltration.com/blog/topic/cleanliness) [hydraulic oil](https://www.hyprofiltration.com/blog/topic/hydraulic-oil) [Podcast](https://www.hyprofiltration.com/blog/topic/podcast) [Factoryside Chat Podcast](https://www.hyprofiltration.com/blog/topic/factoryside-chat-podcast) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [kidney loop](https://www.hyprofiltration.com/blog/topic/kidney-loop) ###### 2 min read ### [Factory Side Chat Podcast, Episode 8, Partners for Life](https://www.hyprofiltration.com/blog/factorysidechatepisode8) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Jun. 02, 2022 [![](https://www.hyprofiltration.com/hubfs/episode%207%20podcast.png) ](https://www.hyprofiltration.com/blog/factorysidechatepisode8) ## Hy-Pro's Factoryside Chat is now available on Apple Podcasts, Spotify, Podbean, and YouTube. ###### Topics: [fluid cleanliness](https://www.hyprofiltration.com/blog/topic/fluid-cleanliness) [cleanliness](https://www.hyprofiltration.com/blog/topic/cleanliness) [hydraulic oil](https://www.hyprofiltration.com/blog/topic/hydraulic-oil) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [Podcast](https://www.hyprofiltration.com/blog/topic/podcast) [Factoryside Chat Podcast](https://www.hyprofiltration.com/blog/topic/factoryside-chat-podcast) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [partners for life](https://www.hyprofiltration.com/blog/topic/partners-for-life) ###### 5 min read ### [Dynamic Filter Efficiency](https://www.hyprofiltration.com/blog/dynamic-filter-efficiency) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Thu, Mar. 18, 2021 # Dynamic Filter Efficiency ## What is Dynamic Filter Efficiency? ### Dynamic Filter Efficiency matches filter testing with real-life conditions.  All hydraulic and lube systems have a critical contamination tolerance level that is often defined by, but not limited to, the most sensitive system component such as servo valves or high speed journal bearings. Defining the ISO fluid cleanliness code upper limit is a function of component sensitivity, safety, system criticality and ultimately getting the most our of hydraulic and lube assets.  ###### Topics: [varnish in hydraulic oil](https://www.hyprofiltration.com/blog/topic/varnish-in-hydraulic-oil) [vacuum dehydration](https://www.hyprofiltration.com/blog/topic/vacuum-dehydration) [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) [coalesce technology](https://www.hyprofiltration.com/blog/topic/coalesce-technology) [cleanliness](https://www.hyprofiltration.com/blog/topic/cleanliness) [COD](https://www.hyprofiltration.com/blog/topic/cod) [lube oil](https://www.hyprofiltration.com/blog/topic/lube-oil) [turbine oil](https://www.hyprofiltration.com/blog/topic/turbine-oil) [glass media](https://www.hyprofiltration.com/blog/topic/glass-media) [demulsibility](https://www.hyprofiltration.com/blog/topic/demulsibility) [servo valves](https://www.hyprofiltration.com/blog/topic/servo-valves) ###### 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) ###### 1 min read ### [Removing Water from Diesel; Hy-Pro's Coalescing Technology](https://www.hyprofiltration.com/blog/removing-water-from-diesel-hy-pros-coalescing-technology) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Wed, Mar. 25, 2020 [![](https://www.hyprofiltration.com/hubfs/Thumb%20Nail.jpg) ](https://www.hyprofiltration.com/blog/removing-water-from-diesel-hy-pros-coalescing-technology) In this Video we provide a brief description and demonstration of Hy-Pro's signature coalescing technology found in our FCLCOD and COT model lines. ###### Topics: [filters](https://www.hyprofiltration.com/blog/topic/filters) [coalesce technology](https://www.hyprofiltration.com/blog/topic/coalesce-technology) [fuel](https://www.hyprofiltration.com/blog/topic/fuel) [cleanliness](https://www.hyprofiltration.com/blog/topic/cleanliness) [COD](https://www.hyprofiltration.com/blog/topic/cod) [video](https://www.hyprofiltration.com/blog/topic/video) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) [turbine oil](https://www.hyprofiltration.com/blog/topic/turbine-oil) [All posts](https://www.hyprofiltration.com/blog/all) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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