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Thread: 1ppm combined chlorine

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    1ppm combined chlorine

    hello, newbie here. wondering if i can get some help. here is some info on my equipment:
    -gallons: 24000
    -in ground plaster
    -fc=23ppm
    -cc=1ppm
    -cya=45-50
    -ph=7.2-7.6

    sanitizer used=all clear superchlorinator 56, 1pnd packets, 2 per night-supposed to be the good stuff
    test kit used=taylor 2006


    the readings above were taken as of this morning @ 7:15 am pacific time. i live in cenrtral california.

    for the first time that i can remember i actually had a reading of 1ppm cc. i have been battling green cloudy water for the past week. i been shocking at night for the last three nights and brining fc to at least above 18ppm. the first two nights i been losing about 4 ppm of chlorine over night. shocked last night again and brought ppm to 23. this morning was at 23 still, so that is good, right? however, now i have 1ppm of cc. ( i wasnt really taking the cc readings for the past three days until this morning because i never got a cc reading before)

    my question, per guidelines on this forum, i am supposed to add 10 ppm of free chlorine to get rid of that 1ppm of cc. so do i still add the additional chlorine to bring it up to 10 ppm even though right now it is at 23 ppm already? so wouldnt the fact that it is already at 23 ppm it should get rid of that 1ppm eventually? OR, regardless of how much fc i have, i need to add the additional fc to get rid of the 1ppm pf cc? the water is getting clearer comapred to how it started. i can actually begin to see the bottom floor of the pool now, though it is still dark. been running pump 24/7 and backwashing when psi goes over 11. thanks for any help, ideas, suggestions, information can get.

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    Mod Squad jblizzle's Avatar
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    Re: 1ppm combined chlorine

    Welcome to TFP!!!

    Not sure where you saw the 10ppm FC / 1ppm CC guideline here? You just need to continue to follow the shock PROCESS as described in Pool School until you pass the 3 criteria to stop: Shocking Your Pool

    Shock level for your CYA of 50ppm is a FC of 20ppm which should be your target each time you test and dose. Are you using poolcalculator.com?

    What is your clean filter pressure?

    Also realize the pH test is not valid when FC > 10ppm.

    Finally, and pretty important, the powder you are using is dichlor and is going to quickly make your CYA ridiculously high. You need to switch to liquid chlorine.
    Jason, TFP Moderator
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    Re: 1ppm combined chlorine

    thanks for reply. my clean filter pressure is about 6 psi when and if i only running water through skimmer. what i mean is that i have a lever that allows the option of opening up suction through drain and if both are open then my clean filter psi is 9.

    i read about 10ppm of fc to clear 1ppm of cc in another website, not this one. i will definitely look into this website's guidelines. also, i was under impression (another website) that cya of 50 would require 15 ppm to shock and about 30 to supershock, buit again, i will look into this website's suggestions.

    ph is not valid after 10ppm fc? so there is no way to read a ph at this point?

    yeah, about the chlorine i'm using and the increased cya, i just read about it, so i will use liquid chlorine. anyone have an idea of how much chlorine "Top Job" store bleach has, if you heard of it? thanks again.

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    Isaac-1's Avatar
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    Re: 1ppm combined chlorine

    How much dichlor have you used? because for every 10 ppm of chlorine added it raises your CYA by 9 ppm, so your CYA may already be sky high and can only be lowered by water replacement, which you may want to do before trying to continue. Also how are you testing this?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    alanpaul's Avatar
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    Re: 1ppm combined chlorine

    fhorta,
    Top Job, from the Dollar Store, 2.75%. VERY small print on label. I had some in the garage.
    Alan
    Alan in Wellington, FL - near West Palm Beach
    15,200 gal IG, painted plaster, 1988; 200 SqFt cartridge filter, 2013; 1.5 HP 1-speed pump (uprated), 2005; heat pump, 2005;
    soon to repair (dead) SWG AquaRite T-15 cell, 2005, and replace (dead) suction-side cleaner, 2005.
    Almost everything died this winter 2012-'13, and I know we shouldn't complain... but, Arrgh!

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    Re: 1ppm combined chlorine

    i was using top job liquid chlorine, thought that might clear it, but if it only has 2.75% and i poured 12 gallons of it saturday evening with cya level of 35-40 at that point, so 12 gal times 2.75 is about 33 free chlorine poured into 25k gallons of water, probably no that much. i just recently started using the dichlor powder, a total of 6 bags at the most within last three days. thanks

    ps-using the taylor 2006 kit to test..

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    Mod Squad jblizzle's Avatar
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    Re: 1ppm combined chlorine

    No more dichlor!!! And find some stronger bleach.

    And using the poolcalculator.com ... 12 gallons of 2.75% bleach would only have raised FC by 14ppm.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: 1ppm combined chlorine

    Will do. Wont be able to make it to store until tomorrow for bleach, but will keep pump running. Ill measure chlorine in a while.

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    Re: 1ppm combined chlorine

    About 12 1/2 hours later took chlorine test and first one was 18ppm , so lost about 5ppm on a fairly sunny day with max temp of 85. I then tested again but got reading of 21? What i did different is as soon as i poured two dips of the powder, i swirled for about 15 seconds and immediately started to pour in the drops until sample turned from pink to clear. Immediately after, i poured the 5drops drops to test for cc and no cc present. This morning it had 1 ppm cc. Water is looking clearer. I can now see the bottom deep end much clearer than in the morning. So i guess i can average the 18morning and the 21morning and conclude best guess my fc is at 19.5 . Any thoughts? I do appreciate it.....cya is at 45-50

  10. Back To Top    #10

    Re: 1ppm combined chlorine

    Tsted water this morning and fc is at 18. Tested second time and resulted at 21. Added 5 drops to test cc and and its betweeen .5 and 1. Water looking better each day. I will pour some liquied chlorine in this evening and hopefully be done with shocking.

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