Can muriatic acid and liquid chlorine be added at the same time?

azpooldude

Member
May 14, 2019
23
Scottsdale, AZ
Maybe in different parts of the pool? Or how long should you wait?

Also, one thing I read about adding muriatic acide said to do it when the filter pump has been off for an hour, and dump it in the deepest part, and wait another hour before turning the pump on. Is that correct?

[Link Removed -- UnSafe Advice --- TFP Mod -- Marty]
 
Last edited:

mknauss

Mod Squad
TFP Expert
May 3, 2014
17,641
Laughlin, NV
No No No ----
The Slug is a myth!! You can damage your pool.

Pour all liquid chemicals in a pencil size stream in to your return with the pump running.
 

Mr Bruce

TFP Guide
Mar 24, 2014
2,217
Greenville, SC
I think my eyes rolled out of my head reading that article. I would completely ignore it.

Don't add chlorine and acid at the exact same time, a few minutes between is fine. Always add chemicals with the pool pump running.
 

YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
10,174
Evans, Georgia
WOW.... eeegads. That's certainly risky advice and in this case very well might damage a pool's pretty finish!

You want to add MA over a running return to help dilute it into the water quickly. I always suggest brushing that area also so no small boluses of MA are sitting low in the water against the pool's finish.

I would say adding your Chlorine to another section of the pool after a few minutes should be perfectly fine. But again we want the pump running.

Remember that chlorine vapors and muriatic acid vapors themselves mixed are dangerous....deadly in fact. Why risk mixing them?

Maddie :flower:
 

Donldson

TFP Expert
LifeTime Supporter
In The Industry
Jun 12, 2009
3,558
NW Ohio
I would stay away from Pool University. There is a lot of bad, and sometimes (like in this case) potentially damaging advice on that website.
 

azpooldude

Member
May 14, 2019
23
Scottsdale, AZ
Thanks all of you!

I would stay away from Pool University. There is a lot of bad, and sometimes (like in this case) potentially damaging advice on that website.
Well, I'm glad I found this place (TFP) recently, because the amount of conflicting and erroneous advice to be found by googling about pool chemistry is totally confusing.
 

Donldson

TFP Expert
LifeTime Supporter
In The Industry
Jun 12, 2009
3,558
NW Ohio
Very true. In fact, that same TA reducing idea is what brought me to this site 10 years ago. I was so messed up I thought high TA was causing my pool to be cloudy and was searching for how to reduce it. Well, I may have been way off on what was going on, but I found this place and it got my pool cleared.

Glad you came across TFP, and a belated Welcome! :wave:
 

Zeerob

Well-known member
Sep 9, 2017
60
Portugal, Torres Vedras
If you can add a whole can of MA in one time, you can push it under water at a running return, and let the jet of water more or less suck it out of the can. That way, it gets distributed quit well.
 

kimkats

Mod Squad
LifeTime Supporter
Jul 10, 2012
38,997
Tallahassee, FL
We do not suggest doing the above. Do pH changes a little at a time. If your pH is 8 then shoot for 7.8 and only add that amount of m.a. It is best to go slow and easy. NO whole jugs/cans at one time. Better safe than sorry.
 

Zeerob

Well-known member
Sep 9, 2017
60
Portugal, Torres Vedras
Well, I did not advise to add a full can at a time. I only said how it can be done we you can add a whole can.
I had to add 8 cans when I had to lower my TA down from 295. I could add a half or full can at a time, and found this an easy way to insert and distribute well. With this method, the MA in the can will be replaced with water, so it is difficult to put in less than a full can, although you can put in roughly half a can, and do the other half later.
If you pour in above a return, much will just fall next to the jet, and will just fall to the bottom which is not good.
 

Donldson

TFP Expert
LifeTime Supporter
In The Industry
Jun 12, 2009
3,558
NW Ohio
There is no reason to do it that way. Adding MA slowly in front of a return is the easiest option and doesn't require an entire gallon to be added at one time. Your comment about it falling to the bottom is untrue, if that was happening to you then you were adding it far too quickly.
 

YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
10,174
Evans, Georgia
I'm suspecting that MA comes in smaller *cans* in Portugal. Here in the US it comes in large gallon sized jugs. Perhaps this is why one would use an entire "can". We rarely would ever need as much as a gallon for routine use.
 

Zeerob

Well-known member
Sep 9, 2017
60
Portugal, Torres Vedras
Well our cans are 5L which is about 1.3 gallon :).
Last week I have used 8 of those, doing a half or a full can at a time (bringing TA down from 295).
After a few cans, I found out that the easiest way to do them was pushing a can underwater and let the powerful jet touch the opening. The jet sucks the MA out of the can and shoots it in the pool. When pouring from above the water, I noticed that it was difficult to hit the beam exactly as it is quit narrow. The MA is well visible underwater and I saw part of it falling next to the beam to the bottom.

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