--- title: Donaldson Hy-Pro Lube & Hydraulic Filtration Industry Blog | fluid cleanliness description: fluid 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/fluid-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) ** ###### 9 min read ### [Understanding ISO 4406 Cleanliness Codes: A Complete Guide to Fluid Contamination and Reliability](https://www.hyprofiltration.com/blog/iso-4406-cleanliness-codes) By [Donaldson Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/donaldson-hy-pro-marketing) on Wed, Dec. 03, 2025 [![](https://www.hyprofiltration.com/hubfs/Copy%20of%20Copy%20of%2024%20Hour%20Turnaround%20Case%20Study%20Banner%20(2).png) ](https://www.hyprofiltration.com/blog/iso-4406-cleanliness-codes) ###### Topics: [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [fluid cleanliness](https://www.hyprofiltration.com/blog/topic/fluid-cleanliness) [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [cleanoil](https://www.hyprofiltration.com/blog/topic/cleanoil) [hydraulic oil cleanliness](https://www.hyprofiltration.com/blog/topic/hydraulic-oil-cleanliness) [hydraulic oil maintenance](https://www.hyprofiltration.com/blog/topic/hydraulic-oil-maintenance) [lubrication systems](https://www.hyprofiltration.com/blog/topic/lubrication-systems) ###### 2 min read ### [24-Hour Turnaround: How Clean Oil Restored Production at a U.S. Paper Mill](https://www.hyprofiltration.com/blog/24-hour-turnaround-how-clean-oil-restored-production-at-a-u.s.-paper-mill) By [Donaldson Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/donaldson-hy-pro-marketing) on Wed, Nov. 05, 2025 [![](https://www.hyprofiltration.com/hubfs/24%20Hour%20Turnaround%20Case%20Study%20Banner%20(2).png) ](https://www.hyprofiltration.com/blog/24-hour-turnaround-how-clean-oil-restored-production-at-a-u.s.-paper-mill) ###### Topics: [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [fluid cleanliness](https://www.hyprofiltration.com/blog/topic/fluid-cleanliness) [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) [cleanoil](https://www.hyprofiltration.com/blog/topic/cleanoil) [hydraulic oil cleanliness](https://www.hyprofiltration.com/blog/topic/hydraulic-oil-cleanliness) [hydraulic oil maintenance](https://www.hyprofiltration.com/blog/topic/hydraulic-oil-maintenance) [lubrication systems](https://www.hyprofiltration.com/blog/topic/lubrication-systems) ###### 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) ###### 1 min read ### [Hy-Pro Vac-U-Dry Vacuum Dehydrator (VUD) Explainer Video](https://www.hyprofiltration.com/blog/vud) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jul. 26, 2022 [![](https://www.hyprofiltration.com/hubfs/vud.png) ](https://www.hyprofiltration.com/blog/vud) ## Contamination is Complicated; Removing it is Easy ### Check out our latest product explainer video on Hy-Pro's VUD ### The optimized balance between heat, vacuum, process design, and an easy, user-friendly operating system for removal of water and particulate from hydraulic and high viscosity lubricating oils. Equipped with generously sized, high-efficiency filtration, the VUD is the ultimate oil purifier. Keeping fluids clean and dry extends component and bearing life, increases productivity, minimizes downtime, and extends useful fluid life. The VUD is ideal for removing all forms of water, including free, emulsified, and dissolved water and gas from hydraulic and lubricating oils.   ###### Topics: [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [fluid cleanliness](https://www.hyprofiltration.com/blog/topic/fluid-cleanliness) [vacuum dehydration](https://www.hyprofiltration.com/blog/topic/vacuum-dehydration) [vacuum dehydrator](https://www.hyprofiltration.com/blog/topic/vacuum-dehydrator) [fluid contamination](https://www.hyprofiltration.com/blog/topic/fluid-contamination) [VUD](https://www.hyprofiltration.com/blog/topic/vud) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [hypro](https://www.hyprofiltration.com/blog/topic/hypro) ###### 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) [All posts](https://www.hyprofiltration.com/blog/all) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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