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Thread: Chlorine Demand

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    Default Re: Chlorine Demand

    In your pool, each gallon (4 quarts) of plain, unscented 6% bleach will add about 2.5ppm of chlorine. Use that as a reference to help you figure out doses of bleach to add. Each time you test the chlorine, add enough bleach to get back up to shock level. You want to keep doing this until you can go from sundown one evening to within two hours of sunrise the next day without losing more than 1ppm of chlorine overnight. Then, keep the chlorine high for one more day for added insurance and then you can let the chlorine drift down and make sure to keep it between 5-10ppm ALL the time. (See the Best Guess Chlorine Chart in my signature up in post #2 for info on the relationship between CYA and chlorine levels.)

    20 Mule Team Borax (laundry aisle at Walmart) is used to raise pH and baking soda is used to raise alk.

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    gfritz1 is offline Registered+ Thread Analyst gfritz1 0
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    Default Re: Chlorine Demand

    OK THANKS for the help -I did a partial drain upon returning as took down roughly 15inches and refilled starting Friday soi refill was Sunday and Sunday night and Monday added the 20 Mule Team . It took roughly 8 lbs (2 boxes) plus a 5 lb PH+ I had but it is now 7.8 and holding .AMAZING .Last night at dark with a FC of zero added 8.5 gals of bleach and 2- 15000 bags of shock . FC was above 20ppm and by daylight it was still above 20ppm.Extremely sunny day in PA so pool has been in sun all day .It sparkles. My present readings almost 24 hors after super shock FC 12.5PPM CC 0 TC 12.5 PH 7.8 Hardness 190 Alk 140 and cya 72. So FEEL PRETTY GOOD NOW . The chlorinator is off and empty . So what do I do now to continue ? I know you said no more tri chlor or the shocks others then lithium or bleach. What do I use to replace the chlorinator for daily treatment? I assume still add alegcide on weekend and the shock (bleach-how much?) .This is amazing -await your response - GFritz1

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    Default Re: Chlorine Demand

    Just use bleach for your daily chlorine. With a CYA of 72 (how did you get that number??), you need to keep your chlorine levels between 5-10 all the time. You do not need to use algaecide and you also do not need to routinely shock unless you are having a CC reading greater than 0.5, cloudy water or see the beginnings of algae. If you maintain your chemistry properly, you rarely need to shock.

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    gfritz1 is offline Registered+ Thread Analyst gfritz1 0
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    Default Re: Chlorine Demand

    CYA was measured with the Taylor Test Kit and looking until the Black Spot disappears. The Pool place got 50 using test strips .

    Understand to use the bleach so this means daily check of chlorine level and then based on reading add bleach with each gallon expected to raise my ppm by 2.5

    Is there a better time to add the bleach? I normally run pump from 7am-7pm and the swimmining usually is from 2-6 but normally only adults doing laps. I understand need to keep higher but like this weekend grandchildren will be here. Whats the safe limit for them to swim-upper ppm level -----thanks again

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    Default Re: Chlorine Demand

    The best time to add bleach is in the evening when the sun is off the pool. In that way, all the chlorine can go to oxidizing the goo in the water and none of it will be lost to the sun. However, it is also ok to add it at other times. Especially when a pool is fighting algae, or has a high chlorine demand for some reason, etc.

    Keep your chlorine between 5-10ppm. Your grandchildren are perfectly safe when swimming with chlorine at those levels with a CYA of 70ish. (Actually, it is also fine to swim when chlorine is at shock level but you probably would want to wear an old swimsuit if you did so.) People are often afraid that a chlorine level of 5-10ppm is too harsh; but the fact is that with a CYA of 70, chlorine is no harsher at 5-10ppm than it is at 1-3ppm with no CYA.

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    gfritz1 is offline Registered+ Thread Analyst gfritz1 0
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    Default Re: Chlorine Demand

    Well its been 8 days since we did the partial drain and the shock using bleach to above 20ppm . The water has remained excellent and the grandchildren were here for weekend and enjoyed three days of swimming .I am losing about 2-3 ppm per day of FC as each day need to add roughly 1 gal of bleach (6%). Is this normal ? Weather was actually more overcast than sun . I have been able to hold between 5 ppm and 9ppm by moring add of bleach.My new readings Sat were as follow
    My cya appeared to increase to 80 which I was suyrprised as no tabs are bing used and teh chlorinator is actually turned off
    PH is 7.8
    FC was 5.6 and CC was o
    Alk was 150
    Hardness was 170

    Have not added anything other then bleach

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    Default Re: Chlorine Demand

    Quote Originally Posted by gfritz1 View Post
    I am losing about 2-3 ppm per day of FC as each day need to add roughly 1 gal of bleach (6%). Is this normal ?
    That's on the high end of normal . . . but still normal. You may find the results improve if you lower the pH some. If you'll fill out the pool chart
    Pool Chart Entry Form
    I'll try to look and see what you might do to improve the situation a little.

    Something else you can try: adding large doses of bleach in the late evening, via the skimmer. This can help clean out any 'goo' in your filter. Again, if you'll complete the chart, I can calculate doses.

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    gfritz1 is offline Registered+ Thread Analyst gfritz1 0
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    Default Re: Chlorine Demand

    I initially filled out the pool chart a few weeks ago. Is it not saved?

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    Default Re: Chlorine Demand

    Yep! It's there. Sometimes we forget that we have already asked somebody to fill it out with all the people we help each day!

    With a CYA of 80, you need to be keeping your FC between 5-10 all the time. Losing 2-3ppm of FC in a day is very normal. In a 23,000 gallon pool, each gallon of 6% bleach will add about 2.5ppm of chlorine.

    If you want to shock the pool to try and make sure the filter is clear of any goo, your shock level would be 20ppm. So, use the reference I gave you above to figure out how much bleach to add when you test to take it up to 20. If you can go from sundown one evening to within two hours of sunrise the next morning without losing more than 1ppm of chlorine, have a CC reading no higher than 0.5ppm and have clear water, then you are good to go and can let the cl drift back down to 5-10.

    Hope this information helps.

  10. #20
    gfritz1 is offline Registered+ Thread Analyst gfritz1 0
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    Default Re: Chlorine Demand

    I did the 20 ppm about a week ago from sunset to sundown but for sure lost more than 1 ppm so what does that mean? I have been able to hold a FC reading above 5 ppm the last week but until yesterday had been losing 2-3 ppm . Im away again so had my brother in law check pool the night before and it was at 3 ppm so he added like 5 quarts of bleach at sunset and let pump on. Last night was still 7 ppm so will check tonight. question with much time away am I overall better looking at SWG or do all teh same issue stay the same with checking daily etc? Thanks

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