--- title: Donaldson Hy-Pro Lube & Hydraulic Filtration Industry Blog | Water Contamination description: Water Contamination | 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/water-contamination#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) ** ###### 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) ###### 4 min read ### [Diesel Fuel Filtration 101](https://www.hyprofiltration.com/blog/bid/335796/diesel-fuel-filtration-101) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Wed, Apr. 02, 2014 [![](https://www.hyprofiltration.com/hs-fs/file-520621061-jpg/images/shutterstock_85522450.jpg) ](https://www.hyprofiltration.com/blog/bid/335796/diesel-fuel-filtration-101) # Reduce unplanned downtime and maximize the fuel efficiency of your diesel engines Diesel engines are widely used today. You can find them inside buses and tractor trailers traveling our roads, humming along in construction equipment and drill rigs, submerged in marine environments, and helping save lives in hospital generators, amongst many other applications. Diesel engines are popular for good reason. Not only do they have cleaner exhaust emissions, but they are also known for more reliable starts in extreme temperatures. ###### Topics: [water](https://www.hyprofiltration.com/blog/topic/water) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [diesel](https://www.hyprofiltration.com/blog/topic/diesel) [filtration](https://www.hyprofiltration.com/blog/topic/filtration) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) ###### 4 min read ### [What is a Vacuum Dehydrator?](https://www.hyprofiltration.com/blog/bid/317139/what-is-a-vacuum-dehydrator) By [Scott Howard](https://www.hyprofiltration.com/blog/author/scott-howard) on Mon, Sep. 30, 2013 [![](https://www.hyprofiltration.com/hubfs/VUD%20Vacuum%20Dehydrator-890287-edited.jpg) ](https://www.hyprofiltration.com/blog/bid/317139/what-is-a-vacuum-dehydrator)   Article Summary This article breaks down the three types of water found in industrial oil systems—free, emulsified, and dissolved—and why each one matters to fluid condition and equipment reliability. It also explains how vacuum dehydration removes water, including dissolved water that many other methods cannot effectively address. If the hydraulic, lubricating, compressor or gear oil you use is not made of a water base in formulation , then water is considered a contaminant and must be recognized and managed. ###### Topics: [water](https://www.hyprofiltration.com/blog/topic/water) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [vacuum dehydrator](https://www.hyprofiltration.com/blog/topic/vacuum-dehydrator) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) [VUD](https://www.hyprofiltration.com/blog/topic/vud) ###### 2 min read ### [Hydraulic Oil Water Removal](https://www.hyprofiltration.com/blog/bid/242999/hydraulic-oil-water-removal) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Wed, Nov. 14, 2012 [![](https://www.hyprofiltration.com/hs-fs/file-18431036-png/images/removing_water_from_oil-resized-600.png) ](https://www.hyprofiltration.com/blog/bid/242999/hydraulic-oil-water-removal) Water is a compound that is required for practically everything on the earth. But within a lubrication or hydraulic system, it's one of the most damaging contaminants possible. Unfortunately, it's also one of the most common contaminants you'll find in your system.  ###### Topics: [water](https://www.hyprofiltration.com/blog/topic/water) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [hydraulic oil](https://www.hyprofiltration.com/blog/topic/hydraulic-oil) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) ###### 2 min read ### [Oil Vacuum Dehydrators: Managing Water in Rolling Mill Lubricating Oil](https://www.hyprofiltration.com/blog/bid/213933/oil-vacuum-dehydrators-water-in-rolling-mill-lubricating-oil) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Fri, Aug. 31, 2012 [![](https://www.hyprofiltration.com/hs-fs/file-18425453-png/images/appearanceofwater.png) ](https://www.hyprofiltration.com/blog/bid/213933/oil-vacuum-dehydrators-water-in-rolling-mill-lubricating-oil) In our last post, [Improving Rolling Mill Oil with Vacuum Dehydration](https://info.hyprofiltration.com/blog/bid/203307/Vacuum-Dehydration-and-Rolling-Mill-Oil), we discussed how the demulsibility (ability of the oil to separate from water) of oil is an important characteristic that greatly influences the effectiveness of the lubricant and how a loss of demulsibility can result in poorly lubricated bearings, unplanned downtime and premature fluid replacement.  ###### Topics: [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [water](https://www.hyprofiltration.com/blog/topic/water) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [rolling mill lubricating oil](https://www.hyprofiltration.com/blog/topic/rolling-mill-lubricating-oil) [vacuum dehydrator](https://www.hyprofiltration.com/blog/topic/vacuum-dehydrator) [VUD](https://www.hyprofiltration.com/blog/topic/vud) [All posts](https://www.hyprofiltration.com/blog/all) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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