I need to add 4 lbs of shock calcium hypochlorite is what I am using. I have 2 pounds of 68% and 2 pounds of 73%. Can I add them at the same time? Should I add one kind then the other after a certain period of time to let it mix first. They are different brands. Need to Slam and I want to do it tonight. Thanks
cal shock for slam
- Thread starter plumerella
- Start date
- May 3, 2014
- 62,698
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Using cal hypo for a SLAM is not recommended. Realize your pool will likely cloud up using that much cal hypo at once.
You can add both at the same time. Though I would space out the additions a bit to try and keep the pool from going cloudy.
Please read SLAM Process
You can add both at the same time. Though I would space out the additions a bit to try and keep the pool from going cloudy.
Please read SLAM Process
The SLAM Process is more than a 1-time addition. It's a process and that amount of cal-hypo will only add about 16 ppm FC to your water. I don't know what your CYA is but that's not exactly a lot for an entire SLAM. You're going to need liquid chlorine to do this right.
As far as the cal-hypo itself, there's no reason you cannot add them at these at the same time.
As far as the cal-hypo itself, there's no reason you cannot add them at these at the same time.
I used the pool math. My pool is clear opened 2 days ago. New glass in filter. Levels all good just chlorine not holding. Swg
- Feb 6, 2015
- 7,813
- Pool Size
- 12300
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
There is no need to "shock" a properly maintained pool.
Do an Overnight Chlorine Loss Test to rule out any nascent algae issue.
Post a full set of current test results from one of the recommended test kits. Test Kits Compared
FC
CC
pH
TA
CH
CYA
Salt (if you have a SWG)
Water temp
Do an Overnight Chlorine Loss Test to rule out any nascent algae issue.
Post a full set of current test results from one of the recommended test kits. Test Kits Compared
FC
CC
pH
TA
CH
CYA
Salt (if you have a SWG)
Water temp
FC 1
CC .2
PH 7.4
TA 80
CH 150
CYA 50
.8 yesterday
added 2 bags of hyp cal 73% because that was what I had last night.
FC 1 this morning
CC .2
PH 7.4
TA 80
CYA 50
Was low on salt added 1 40 lb bag today and phos free
FC .2 now
CC .1
Ph 7
TA 80
CH 150
CYA 50
I don’t have chlorine but I have the cal shock
22,000 galloons swg new glass i. filter etc 2 days ago
CC .2
PH 7.4
TA 80
CH 150
CYA 50
I did I have chlorine loss
.8 yesterday
added 2 bags of hyp cal 73% because that was what I had last night.
FC 1 this morning
CC .2
PH 7.4
TA 80
CYA 50
Was low on salt added 1 40 lb bag today and phos free
FC .2 now
CC .1
Ph 7
TA 80
CH 150
CYA 50
I don’t have chlorine but I have the cal shock
22,000 galloons swg new glass i. filter etc 2 days ago
- May 3, 2014
- 62,698
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Your TA is fine.
Do not run the SWcG when adding cal hypo. You can scale up the cell quickly.
Do not run the SWcG when adding cal hypo. You can scale up the cell quickly.
So I turned off the swg added 2 lbs of cal shock last night. Tons of dead algae on bottom. Assuming I have mustard algae.
Bought liquid chlorine today. Figured out the slam amount. After back wash vacuum and scrub added more to slam. just checked and added more chlorine to raise FC again. will test again when sun goes down and add more if needed and test for overnight loss tomorrow morning.
Cya is 45
PH is 8 I assume because Chlorine is high.
CC is .2
do I lower this during SLAM? or just ignore it for now?
Bought liquid chlorine today. Figured out the slam amount. After back wash vacuum and scrub added more to slam. just checked and added more chlorine to raise FC again. will test again when sun goes down and add more if needed and test for overnight loss tomorrow morning.
Cya is 45
PH is 8 I assume because Chlorine is high.
CC is .2
do I lower this during SLAM? or just ignore it for now?
- May 3, 2014
- 62,698
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Because my pool is clear and after SLAM last night dead algae was on the ground. I can't keep the FC up.
None of that sounds indicative of mustard algae. You've been regularly dipping below the minimum FC for your CYA so organics have had a chance to grow. Sounds like you've just been sitting on the verge of an all-out bloom but have been adding just enough chlorine to keep it from exploding. Following the SLAM Process will eradicate it completely so there's nothing left in the water to create an overwhelming FC demand and your SWG will be able to keep up again.
Okay, I think I understand. If I have FC high enough for slam today and do not have chlorine loss tomorrow, then do I add CYA to get it higher and balance the rest of the water levels again?
Trying to do the SLAM properly
- May 3, 2014
- 62,698
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Read the SLAM Process article.
Once you pass the three criteria, then raise your CYA to target levels, check the pH, and maintain FC levels.
Once you pass the three criteria, then raise your CYA to target levels, check the pH, and maintain FC levels.
When I do the overnight test, do I leave the filter on or turn it off? I know I turn the swg off.
- May 3, 2014
- 62,698
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
From the article
- Run the pump 24/7 until you are done SLAMing.
Overnight chlorine test failed
last night
FC 18.2
this morning
13.8
some black stuff on bottom I am assuming dead algae
pool is clear I added pics
Do i just vacuum this or vacuum to waste. I am a little confused
last night
FC 18.2
this morning
13.8
some black stuff on bottom I am assuming dead algae
pool is clear I added pics
Do i just vacuum this or vacuum to waste. I am a little confused
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also I have 2 deck jets. Do I let the chlorine run theough them when it is high slamm chlorine?