12% bleach: how to pour?

wkussmaul

Gold Supporter
LifeTime Supporter
Aug 29, 2010
45
#1
Hi all,
This is my second season using the BBB method and I want to report excellent results.
Not a hint of algae, CYA levels now manageable since I stopped using pucks.

I am fortunate that my local pool supply stocks the large blue carboys of 12% bleach.

But: they are a bear to handle and pour. Anyone know of a handy spout, or a hand-pump that wouldn't be destroyed by the bleach?
Or do most people just pour it in and then splash water around to clean up the drips?
 

gullzway

Well-known member
Nov 12, 2009
104
Tulsa,OK
#3
I leave mine in the bucket and use some irrigation drippers along with a valve on the suction side of the pump to safely get it in the pool.
 

Speedo

LifeTime Supporter
May 4, 2011
636
#4
Can you provide more details/close ups on how the dripper is installed? Is there any ability to control the flow?
 

WorBry

Well-known member
Nov 19, 2011
127
#5
I was wondering the same. Looks like its connected to the pump drain port and presumably the flow is regulated by the little blue (ball?) valve there; I hope it's corrosion-resistant.

Neat idea but what happens when the pump goes off - surely concentrated chlorine accumulates in the pump chamber, which can't be a good thing, unless you manually close the valve each time, or are running 24/7.

As someone who has just switched to BBB, and adds it (10.8% pool bleach) manually in front of the return flow, I was also wondering - surely there is appreciable degradation of concentrated bleach when held outside in a container like that, even in the shade. Do you dilute it first? I would assume the same consideration applies to feeders like the Liquidator also?

I store my bleach in my basement, the coolest place. It's not such a big deal for me to take a 4L container out there once a day (mid-evening for me), measure it out in a jug (typically 0.75 - 1 L) and pour it in. Takes less time than it does to test the FC level (FAS-DPD) for dosing. There again, it's still a novelty for me :wink:

wkussmaul, if the large carboy containers are difficult to manage (as I am sure they are), why not distribute into smaller containers (say empty 4L jugs) for storage and/or in-use.....uh, like in the link Jason provided (now I've looked at)?
 

gullzway

Well-known member
Nov 12, 2009
104
Tulsa,OK
#7
bobodaclown said:
I think this may be the post being referred to: homemade-acid-or-chlorine-injection-system-t4174.html
That's where I got the idea. Its a simple pvc valve with some tubing and irrigation drippers from Lowes/home depot. Connected to the suction side drain of the pump. The drippers slow the flow down, you have to experiment with the amount of drippers depending on pump run time. I run mine 6 hrs/day. 5 gallons lasts around 2 Weeks on my pool.

As far as the bleach degrading, I don't know, but I wouldn't think in 2 Weeks it would lose much strength. Not too concerned as I get it from my work where we have two 3000 gallon tanks of 12.5% chlorine.

When the pump shuts off it stops siphoning chlorine, so I doubt there is that much of a concentration in the pump.
Also, you have to close the valve if your using a suction side cleaner like my kreepy krauly, or it will suck all the chlorine in the pool due to the increased suction head.

 

WorBry

Well-known member
Nov 19, 2011
127
#8
gullzway said:
As far as the bleach degrading, I don't know, but I wouldn't think in 2 Weeks it would lose much strength.
According to these data, around 10-12% loss in strength at 80oF over 2 weeks and maybe double that at 90oF......at least with 'commercial' 12.5% bleach

chlorine-degradation-due-to-heat-over-time-t24789.html

http://www.odysseymanufacturing.com/decomp_curve.htm

gullzway said:
Not too concerned as I get it from my work where we have two 3000 gallon tanks of 12.5% chlorine.
Yeah, I guess that helps. :)

The Purox bleach I get from Canadian Tire is stated to be 10.8% (guaranteed) on the label. The MSDS however states 7-13% sodium hypochlorite.

http://www.sissiboofarmsupplies.com/MSDS/Clorox.pdf

I can't believe it's that variable at production so probably they (Clorox Canada) produce at 13% and allow for a loss of up to 46% through handling, distribution and storage. So I reckon the 10.8% must be based on an average production-to-in-store interval of something like two weeks. The 7% then allows for a more gradual degradation over a period of months in-store.

I guess if you're getting your 12% stuff from a plant source you've got a head start. Also if you are dosing with a (semi) continuous feed, it's less of an issue, and you can regulate accordingly. But if, like me, you are single dosing a calculated volume of bleach, it's potentially more significant. For now however, the 5 or so 4L bottles I've bought have given the expected rise in FC ppm, so they must be around 10% at least. If I do continue using the Purox later in the season (assuming stocks last) I might be inclined to confirm the concentration and I don't think I'd stockpile.

Several years back CaOCl2 tested a batch and found it to be down to 8.5%:

practices-in-a-pool-store-piercing-the-veil-of-ignorance-t25345-20.html

Interesting that the MSDS for Clorox Ultra (6%) states a concentration range of 5-8%.

http://msds.flexoproducts.com:8000/MSDS ... X%2012.pdf

Which perhaps gives greater confidence that you are actually getting your 6%.
Also the evidence is that 5% bleach has something like 3X the half life of 10% bleach and 7X that of 15% bleach at temperatures ranging from to 75- 90oF

http://www.odysseymanufacturing.com/about_product.htm

So, I think if I was to consider a similar sort of regulated flow dosing system I'd maybe look at using a more dilute bleach solution, even if that involves filling up the feed reservoir more often.
 

wkussmaul

Gold Supporter
LifeTime Supporter
Aug 29, 2010
45
#9
Thanks for all the above suggestions.
The DIY auto-chlorinator is too much for me.

My solution, suggested by several, was to use 5/8" clear plastic tubing to siphon the bleach into jugs.
With practice, I can now do this without getting any on my hands (I hate that smell!).

JasonLion's link given above contains a detailed how-to.