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Young Mary Lewis Karen Thompson Edward

Clark Jessica Moore Ronald Taylor Joseph

Allen Kevin Walker William Wilson Betty

Slowly? That's a tremendous volume drawing down; you just emptied a large swimming pool's worth of water in just a few seconds!

Thank you so much!! It really works

THANK YOU SO MUCHHHHH

Thanks a lot.

U ARE A LEGEND!

How can we get a design blueprint for a system that works in the same way?

Why does the equation get kinda "smooshed in" for a lack of a better word lol

finally a hero that i need.. thanks man

5 years later, still helping folks! thanks man

how can i do this automatically?

GOATED!!

Our whole class used this video as presentation to understand backwashing...from IIT Bhubaneswar

That scale on the left doesn't show up for me, how can i see it?

Currently writing my thesis and of course I end up on your page! Teaching me through my undergrad just wasn't enough! Hope you are doing well, thanks for this and everything else! -Nick Richardson (Class of 21)

I am also working in the wastewater field in Vietnam

Thank you Sir 🙏

Amazing! so helpful

Sorry but chapter 10 of the book is titled filtration and not disinfection

4 years later, still helping folks! thanks man

You're a wizard. But a follow up question, it seems to make my equations appear in inline, vertically condensed format. It screws up sums and integrals...

WOW.

Great work man, I think the guy who invented Word doesn't even know this.

Thanks you so much to explain in an easy way, I am biochemistry students... doing my titration to determine hardness of water for my internal assessment.

By using tab equation font changes format. In more complex equations (for example containing summation symbol) this procedure is not appropriate.

How can we add hyperlink or something like that to properly referencing it in other part of document.

Thanks. God Bless U my brother

Short and straight to the point, thank you!

You are a God!

Help It seems that I have hidden the "tab stop" bar... Where from can I activate it again?

Thank you for sharing. It is very useful.

what is the view so you have those tab markings

What about the [Mg2+]? All those magnesium ions look so lonely. All the other ions got to participate in the fun equation.

Thank you sir!

Man, you are a genius. I've read all those articles about how to insert a stupid equation, and now you showed up with exactly with what I needed

Our procedure Drop the filter at 0.20 m 4 min of air bubble 1 min of purge High wash with 1100 m3h to 30 UTN Low wash with 375 m3h to 5 UTN (prevent high spike of turbidity in prefiltration) Prefiltration spike around 0.130 UTN and we want under .080 UTN takes about 20-30 min Turbidity while filtration usually .020 UTN all year around. In summer we use alum in washing to have no spike at all in prefiltration. All procedure takes around 1 h 30 min to back filtration. Filter is sand and actif carbon, 96 hours of filtration, around 100-150 m3 each filter. Do you have suggestion to improve our procedure?

Thanks a lot

Hi David Ladner. Just a quick question. I have a larrge pond, that has alklainity of 100ppm, pH of 8.5, and is filled with bacteria. I am planning to add calcium hypochlorite into it. I understand at high pH most of the form of the hypochlorite ion will be in the less favourable form, hypochlorite, and very little hypochlorous acid will be there. Now, since hypochlorous acid is much much more effiecent (80x) at kiling bacteria, i assume once added, its concentration will be depleted quite quick. Since it is in equilibrium with hypochlorite ion and H+, so wont the equilibrium respond by shifting left, thus increasing the concentration of the hypochlorous acid and thus reducing the concentration of the hypochlorite ion?

I never comment, but bless you, sir.

Excellent 👍

THANK YOU!

Update; the Hach field titrator dispenses 0.00125 mL/per digit. I figured the mL of titrant dispenses , along with the N of the titrant (1.6 N H2SO4), and your equation allowed me to confirm the accuracy of our titrations for alkalinity. Thanks for your video.

I use 1.6 N H2SO4 fo my alkalinity titrations in 100 ml. of sample and it reads directly mg/L CaCO3 . It is the Hach portable titrator. I will have to do the math and stoichiometry using your method to make sure this is correct (Hach says it is). The only problem is I need to find out how much titrant the Hach titrator per turn of it's odometer like display. (the titrant comes in a syringe type dispenser.

Very helpful. However once I thought of how much you sound like Paul Rudd in this video, I’ve been distracted and waiting for this to turn into a skit.

After how long after giving chlorine dose in 1 liter jar, residule chlorine is checked 

May I have a copy of your presentation

A big problem I have with this is that it requires you to manually number the equations, which is a very bad idea if you have many equations and you want to cross reference them. edit: works also with automatic numbering, my bad

Thank you very much