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Michaelg90

Well-known member
Mar 10, 2019
104
Orlando
So I did my weekly result for my log this afternoon and here are my results:

(This week was not CYA or CH)

P/H: 7.6
FC:4.5
CC:0
TA: 70

CYA from last test 60
CH from last test 375

So I usually bring the FC to 8 or 9 first and this will bring the PH up to 8.2/8.3 then I add 2-3 cups of acid. However with TA at 70 should I bring this up first then do liquid Chlorine and then acid? 45 wait in between each?

Thank you
 
Do not test pH right after adding liquid chlorine. The pH rise you see from the liquid chlorine neutralizes as the chlorine is consumed. Do your pH and FC testing at the same time and use those results to add what you need. Your pH does not need any adjustment at this time.
 
mknauss said:
Do not test pH right after adding liquid chlorine. The pH rise you see from the liquid chlorine neutralizes as the chlorine is consumed. Do your pH and FC testing at the same time and use those results to add what you need. Your pH does not need any adjustment at this time.
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So what happens if the chlorine isn’t used for a few days would the pool sit at a high PH? What about TA at the level now?
 
When you add liquid chlorine it is pH neutral. The chlorine is consumed by UV and organics.

Your TA and pH are fine right now. Test the pH again in a few days. Only adjust pH when it gets to 8 and then only drop it to 7.6. TA only adjust when it gets to under 50 ppm or your pH becomes unstable.
 
Alright well that is new info on the PH rise for me. I always thought it was just an after effect of using liquid versus tabs (where tabs are acidic) and after mixed in the pool you would need to add acid to lower. Well that makes my life much easier then. Thank you. I’ll just add my chlorine and test my PH agian on Thursday for my next review. Anything you recommend right now?

While I have you, we plan to go away for two weeks in August. I’m going to shock the pool prior and add two pucks prior to leaving. If my PH is at a 7.5 at that time I should be good for the 14 days right? Nothing else needed?
 
Maintain your FC based on FC/CYA Levels for your CYA level.

When you go away that sounds like a good plan. Calculate how much those two tablets will add in FC and CYA over the time you are gone. I would be concerned that two tablets may not be enough for 14 days. Be sure to account for the CYA rise when you return.

The discussion on the pH and liquid chlorine is not in the book as it is pH neutral so no need to confuse the discussion. It is in the articles in The Deep End forum.
 
mknauss said:
Maintain your FC based on FC/CYA Levels for your CYA level.

When you go away that sounds like a good plan. Calculate how much those two tablets will add in FC and CYA over the time you are gone. I would be concerned that two tablets may not be enough for 14 days. Be sure to account for the CYA rise when you return.

The discussion on the pH and liquid chlorine is not in the book as it is pH neutral so no need to confuse the discussion. It is in the articles in The Deep End forum.
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I would be also shocking the pool with liquid prior to the adding of the two pucks so I can keep the FC on the higher end so when the daily loss occurs the pucks are adding it back in.
 
+1 what mknauss is telling you on the pH of chlorine.....the net result is neutral.

I also agree with mknauss that 2 pucks are going to be fairly inconsequential in a 15k pool but they won't hurt.....I just doubt you will see much benefit

At TFP, we really don't "shock" a pool, although I understand what you mean. We use a more thorough process (SLAM) that gets your pool water crystal clear.
 

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Michaelg90 said:
I would be also shocking the pool with liquid prior to the adding of the two pucks so I can keep the FC on the higher end so when the daily loss occurs the pucks are adding it back in.
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Keeping your FC elevated with liquid chlorine up to and prior to leaving will have more benefit than the pucks :) while you are gone.
Is there noone that could add a pre-measured dose of liquid chlorine for you a couple times? I would think day 4 & day 8 a "shock" level dose of liquid chlorine (per FC/CYA Levels) would have you arrive home to a 'clean' pool. (Just an idea)
 
So at the level of 24 for CYA of 60, how much liquid should I place in at once? That’s 2 gallons and 3 cups of chlorine. Should I do this over a few hours or two days? I couldn’t find the maximum amount to put in in one day in the book.
 
If you wish to go to SLAM level FC, you add the amount needed based on the results from PoolMath.

Add it all at once. Right before you leave. At a loss of 4+ ppm per day, it will be to zero in about 6 days.
 
Michaelg90 said:
So at the level of 24 for CYA of 60, how much liquid should I place in at once? That’s 2 gallons and 3 cups of chlorine. Should I do this over a few hours or two days? I couldn’t find the maximum amount to put in in one day in the book.
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If your previous additions have resulted in the expected level, you can use PoolMath to add the amount of liquid chlorine needed in front of return with pump running, retest in 30min.
If not, add half the recommended amount (same way, in front of return w/pump running), retest in 30min, if the result is half of intended, add rest of dose... if it's more or less than expected, adjustments in chlorine strength or pool size might be needed.
 
Your daily loss will be a bit higher when you take your FC to SLAM level. But will reduce as your FC goes down.

Good luck.
 
mknauss said:
Your daily loss will be a bit higher when you take your FC to SLAM level. But will reduce as your FC goes down.

Good luck.
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Gotcha. Thanks again for your help. So it sounds like for individuals whom use liquid chlorine as their main sanitizer, when going away either have to a pool service or have a family or friend swing by during extended leave. I would have tought pucks would extend the life of the chlorine howevr your stating it shouldn’t provide much benefit? How would I test the pucks FC addition to the pool. Test with none in and then add one or two depending on my proposed plan for the trip and then test 24 hours later and see in the increased FC level minus daily loss?
 
Two pucks will not. But I bet your feeder holds more. Calculate how many pucks you need to keep 2 or so ppm adding each day. You just have to account for the CYA loss when you return. And be sure you increase your pump rate enough to get the pucks to dissolve.
 
mknauss said:
Two pucks will not. But I bet your feeder holds more. Calculate how many pucks you need to keep 2 or so ppm adding each day. You just have to account for the CYA loss when you return. And be sure you increase your pump rate enough to get the pucks to dissolve.
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Thank you very much. Makes perfect sense. Have a great upcoming week. When it comes time to refill my TF100 I’m making I’ll be sure to donate to the site and use my discount code. Gold supporter here we come ;)
 
So as we discussed if my PH was 7.6 prior to adding 70 ounces of bleach, it raised with the addition of the bleach and will lower back as it’s used. Leaving it at the extended level is fine according to you guys given it will lower back. What happens if at the retest a few days later the PH is still higher let’s assume 8 and I need more bleach? Would I add acid first then 30-45 later do bleach or reverse?
 

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