--- title: Pax Water | Tank Mixers Blog | storage tanks description: storage tanks | PAX Water Technologies develops efficient technology for the water and wastewater industry. --- [![PAX Water](https://blog.cleanwater1.com/hubfs/PAX-Water_Technologies_logo_CMYK-2.png)](https://blog.cleanwater1.com/) [Contact Us](https://blog.cleanwater1.com/contact-us) # [The Mix](https://blog.cleanwater1.com/pax-water-blog) ## [4 Signs Your Standpipe is Stratified](https://blog.cleanwater1.com/pax-water-blog/4-signs-your-standpipe-is-stratified) Posted by [Lily Kaiserman](https://blog.cleanwater1.com/pax-water-blog/author/lily-kaiserman) on 9/24/15 4:00 PM [![](https://blog.cleanwater1.com/hubfs/Old_Town_standpipes_5-1-09.jpg)](https://blog.cleanwater1.com/pax-water-blog/4-signs-your-standpipe-is-stratified) A standpipe is a ground-supported storage tank with a height that is greater than its diameter. Its design helps generate storage and pressure with a low upfront cost compared to elevated tank geometries. **While there are cost advantages to standpipes, its geometry is a liability: tall and skinny tanks naturally promote thermal stratification and harm water** **quality**. Standpipes have a higher surface area to volume ratio – meaning that more surface area is exposed to heat from the sun, and there’s less volume inside the tank to absorb that heat. Additionally, the limited cross-sectional area of a standpipe makes it difficult to exchange heat between the hot water at the top of the tank and cold water at the bottom, resulting in thermal stratification. Below we have compiled four signs that indicate your standpipe is thermally stratified. [Read More](https://blog.cleanwater1.com/pax-water-blog/4-signs-your-standpipe-is-stratified) Topics: [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [eliminate stratification](https://blog.cleanwater1.com/pax-water-blog/topic/eliminate-stratification), [drinking water quality](https://blog.cleanwater1.com/pax-water-blog/topic/drinking-water-quality), [PAX Water Mixer](https://blog.cleanwater1.com/pax-water-blog/topic/pax-water-mixer), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [water circulation](https://blog.cleanwater1.com/pax-water-blog/topic/water-circulation), [passive mixing](https://blog.cleanwater1.com/pax-water-blog/topic/passive-mixing), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems), [low turnover](https://blog.cleanwater1.com/pax-water-blog/topic/low-turnover) ## [Improve Summer Chlorine Levels without Blowing DBPs](https://blog.cleanwater1.com/pax-water-blog/improve-summer-chlorine-levels-without-blowing-dbps) Posted by [Lily Kaiserman](https://blog.cleanwater1.com/pax-water-blog/author/lily-kaiserman) on 8/18/15 1:36 PM [![](https://blog.cleanwater1.com/hubfs/images/Chlorine_image.jpg)](https://blog.cleanwater1.com/pax-water-blog/improve-summer-chlorine-levels-without-blowing-dbps) When summer temperatures rise, chlorine demand inside storage tanks increases and water quality can degrade. Warm water temperatures, particularly at the top of the tank, increase biological growth, deplete residual disinfectant and increase the formation rate of disinfection by-products (DBPs). Thermal stratification also creates hot and humid conditions inside the headspace, greatly accelerating corrosion rates inside steel tanks. One effective solution to combat stratification and maintain disinfectant residual levels is active mixing. A powerful mixer eliminates thermal and chemical stratification inside tanks and reduces the growth of biofilms and DBPs. Below, we answered three common questions on maintaining residual disinfectant levels inside water storage tanks. [Read More](https://blog.cleanwater1.com/pax-water-blog/improve-summer-chlorine-levels-without-blowing-dbps) Topics: [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [eliminate stratification](https://blog.cleanwater1.com/pax-water-blog/topic/eliminate-stratification), [drinking water quality](https://blog.cleanwater1.com/pax-water-blog/topic/drinking-water-quality), [PAX Water Mixer](https://blog.cleanwater1.com/pax-water-blog/topic/pax-water-mixer), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [water circulation](https://blog.cleanwater1.com/pax-water-blog/topic/water-circulation), [passive mixing](https://blog.cleanwater1.com/pax-water-blog/topic/passive-mixing), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems), [low turnover](https://blog.cleanwater1.com/pax-water-blog/topic/low-turnover) ## [3 Design Challenges to Consider Before Mixing Tanks](https://blog.cleanwater1.com/pax-water-blog/bid/85031/3-Design-Challenges-to-Consider-Before-Mixing-Tanks) Posted by [Lily Kaiserman](https://blog.cleanwater1.com/pax-water-blog/author/lily-kaiserman) on 12/11/12 12:21 PM [![](https://blog.cleanwater1.com/hs-fs/file-15736858-jpg/images/tank_with_mixer_illustration.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/85031/3-Design-Challenges-to-Consider-Before-Mixing-Tanks) There are many design factors for operators and engineers to consider when specifying mixers for water storage tanks – ranging from tank size and geometry to obstructing tank internals like columns and baffles. Below are the three of the most common questions we’ve received regarding mixing and storage tank design.  Feel free to add your own tank design challenge to the list by leaving a comment below. [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/85031/3-Design-Challenges-to-Consider-Before-Mixing-Tanks) Topics: [active tank mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-tank-mixing), [eliminate stratification](https://blog.cleanwater1.com/pax-water-blog/topic/eliminate-stratification), [disinfectant residual](https://blog.cleanwater1.com/pax-water-blog/topic/disinfectant-residual), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks) ## [Five Mixing MythBusters](https://blog.cleanwater1.com/pax-water-blog/bid/77887/Five-Mixing-MythBusters) Posted by [Lily Kaiserman](https://blog.cleanwater1.com/pax-water-blog/author/lily-kaiserman) on 5/7/12 12:46 PM [![](https://blog.cleanwater1.com/hubfs/images/mixer-myths.png)](https://blog.cleanwater1.com/pax-water-blog/bid/77887/Five-Mixing-MythBusters) Charles Fishman (author of *The Big Thirst*) wrote a piece for the Washington Post last month on “[Five Myths About Water](http://www.washingtonpost.com/opinions/five-myths-about-water/2012/04/06/gIQAS6EB0S_story_1.html).” Number two on Charles’ myth list is “bottled water is better than tap water,” where he unveils that tap water is actually MORE closely monitored than bottled water and that in blind taste tests “people can’t reliably pick bottled from tap.” At PAX Water, Charles’ article got us thinking about some of the myths we’re trying to bust in the drinking water industry. Here are our top five: [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/77887/Five-Mixing-MythBusters) Topics: [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [eliminate stratification](https://blog.cleanwater1.com/pax-water-blog/topic/eliminate-stratification), [drinking water quality](https://blog.cleanwater1.com/pax-water-blog/topic/drinking-water-quality), [PAX Water Mixer](https://blog.cleanwater1.com/pax-water-blog/topic/pax-water-mixer), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [water circulation](https://blog.cleanwater1.com/pax-water-blog/topic/water-circulation), [passive mixing](https://blog.cleanwater1.com/pax-water-blog/topic/passive-mixing), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems), [low turnover](https://blog.cleanwater1.com/pax-water-blog/topic/low-turnover) ## [Top Mixer Questions from AWWA's Storage Tank Water Quality Webinar](https://blog.cleanwater1.com/pax-water-blog/bid/48331/Top-Mixer-Questions-from-AWWA-s-Storage-Tank-Water-Quality-Webinar) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 10/14/10 8:13 PM [![](https://blog.cleanwater1.com/hs-fs/file-15666301-jpg/images/awwa_webcast1.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/48331/Top-Mixer-Questions-from-AWWA-s-Storage-Tank-Water-Quality-Webinar) The AWWA held a webinar on October 6, 2010 entitled **Sustainable Water Quality Management within the Storage Tank: Part 2** (you can [listen to a rebroadcast here](http://www.awwa.org/Conferences/WebcastsDetail.cfm?ItemNumber=54960&showLogin=N)). [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/48331/Top-Mixer-Questions-from-AWWA-s-Storage-Tank-Water-Quality-Webinar) Topics: [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [WaterMix](https://blog.cleanwater1.com/pax-water-blog/topic/watermix), [biofilms](https://blog.cleanwater1.com/pax-water-blog/topic/biofilms), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems) ## [Active Mixing CAN Reduce Water Age!](https://blog.cleanwater1.com/pax-water-blog/bid/47207/Active-Mixing-CAN-Reduce-Water-Age) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 9/28/10 4:34 PM [![](https://blog.cleanwater1.com/hs-fs/file-15723182-jpg/images/no_residual_at_top.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/47207/Active-Mixing-CAN-Reduce-Water-Age) We learned this week that an engineer (who shall remain unnamed) presented a paper at the [DSS meeting in Maryland ](http://www.awwa.org/files/Conferences/DSS/DSS10/DSSWSCannouncement.pdf)about water age modeling in which he claimed that mixing CANNOT decrease water age.  [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/47207/Active-Mixing-CAN-Reduce-Water-Age) Topics: [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [disinfectant residual](https://blog.cleanwater1.com/pax-water-blog/topic/disinfectant-residual), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [high water age](https://blog.cleanwater1.com/pax-water-blog/topic/high-water-age), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems) ## [Open Letter to the EPA’s Drinking Water Strategy Discussion Forum](https://blog.cleanwater1.com/pax-water-blog/bid/46057/Open-Letter-to-the-EPA-s-Drinking-Water-Strategy-Discussion-Forum) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 9/7/10 8:32 PM [![](https://blog.cleanwater1.com/hs-fs/file-15690433-jpg/images/drinking_water_strategy.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/46057/Open-Letter-to-the-EPA-s-Drinking-Water-Strategy-Discussion-Forum) The EPA recently announced a new strategy to provide clean, safe drinking water and a novel means by which those of us in the water industry, and citizens in general, can comment on it: [an on-line discussion forum](http://blog.epa.gov/dwstrat/). [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/46057/Open-Letter-to-the-EPA-s-Drinking-Water-Strategy-Discussion-Forum) Topics: [Water Quality](https://blog.cleanwater1.com/pax-water-blog/topic/water-quality), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [mixing systems](https://blog.cleanwater1.com/pax-water-blog/topic/mixing-systems), [dbp formation](https://blog.cleanwater1.com/pax-water-blog/topic/dbp-formation) ## [PAX's Active Mixers Reduce Residual Losses – New Article in OpFlow](https://blog.cleanwater1.com/pax-water-blog/bid/43412/PAX-s-Active-Mixers-Reduce-Residual-Losses-New-Article-in-OpFlow) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 7/15/10 8:29 PM [![](https://blog.cleanwater1.com/hs-fs/file-15698296-jpg/images/fire_and_ice_opflow_july_2010_11x17.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/43412/PAX-s-Active-Mixers-Reduce-Residual-Losses-New-Article-in-OpFlow) [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/43412/PAX-s-Active-Mixers-Reduce-Residual-Losses-New-Article-in-OpFlow) Topics: [disinfectant residual](https://blog.cleanwater1.com/pax-water-blog/topic/disinfectant-residual), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [freeze protection](https://blog.cleanwater1.com/pax-water-blog/topic/freeze-protection), [dbp formation](https://blog.cleanwater1.com/pax-water-blog/topic/dbp-formation) ## [It’s Fire Season: How Much Water is in YOUR tanks?](https://blog.cleanwater1.com/pax-water-blog/bid/41464/It-s-Fire-Season-How-Much-Water-is-in-YOUR-tanks) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 6/8/10 6:11 PM [![](https://blog.cleanwater1.com/hs-fs/file-15734216-jpg/images/south_lake_tahoe_post_angora_fire_s.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/41464/It-s-Fire-Season-How-Much-Water-is-in-YOUR-tanks)   [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/41464/It-s-Fire-Season-How-Much-Water-is-in-YOUR-tanks) Topics: [Water Quality](https://blog.cleanwater1.com/pax-water-blog/topic/water-quality), [active mixing](https://blog.cleanwater1.com/pax-water-blog/topic/active-mixing), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [fire storage](https://blog.cleanwater1.com/pax-water-blog/topic/fire-storage), [low turnover](https://blog.cleanwater1.com/pax-water-blog/topic/low-turnover) ## [Getting MORE disinfection with LESS disinfectant with active mixing](https://blog.cleanwater1.com/pax-water-blog/bid/41173/Getting-MORE-disinfection-with-LESS-disinfectant-with-active-mixing) Posted by [Peter Fiske](https://blog.cleanwater1.com/pax-water-blog/author/peter-fiske) on 6/2/10 5:27 PM [![](https://blog.cleanwater1.com/hs-fs/file-15665426-jpg/images/average_loss_s.jpg)](https://blog.cleanwater1.com/pax-water-blog/bid/41173/Getting-MORE-disinfection-with-LESS-disinfectant-with-active-mixing)   [Read More](https://blog.cleanwater1.com/pax-water-blog/bid/41173/Getting-MORE-disinfection-with-LESS-disinfectant-with-active-mixing) Topics: [Water Quality](https://blog.cleanwater1.com/pax-water-blog/topic/water-quality), [disinfectant residual](https://blog.cleanwater1.com/pax-water-blog/topic/disinfectant-residual), [storage tanks](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks), [biofilms](https://blog.cleanwater1.com/pax-water-blog/topic/biofilms) [All Posts](https://blog.cleanwater1.com/pax-water-blog/all) [Next](https://blog.cleanwater1.com/pax-water-blog/topic/storage-tanks/page/2) ### Comments ### Subscribe to Our Blog ### Follow Us ### Recent Posts #### PAX Water Technologies, Inc. 550 Sycamore Drive Milpitas, CA 95035 #### Talk To Us **Phone** 866.729.6493 [Contact Us](https://www.paxwater.com/contact-us) #### Connect With Us   © 2020 PAX Water Technologies, Inc. ##  [A UGSI Solutions Company](http://www.ugsicorp.com/)