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Thread: Getting FC down to target after slamming

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    Getting FC down to target after slamming

    Ended up with a high CYA, around 120 and algae was beginning to form (long story). All other test readings are at normal levels.

    Reduced my PH to 7.2 started to do partial drains and refills to get CYA to get around 60 or so. I'm currently in the middle of this process. Today is my 3rd day into this process. During this partial draining & refill process I went ahead and brought my FC up to Slamming levels with bleach to keep any further growth of algae. Running my pump 24/7 and brushing twice a day and cleaned my filter yesterday. My CYA as of last night was 75-80 or so and am going to do another partial drain this morning and then check my CYA again tonight. Again...I'm keeping my FC at slamming levels during this process which right now is approx. 25. I think that's what it was. It was late I was tired. When I started my slamming FC level was 33. Pool is looking good, algae has been greatly reduced.

    My 1st question is:
    Once I get my CYA down to normal levels, and there still is all this bleach in the pool from slamming, does it just evaporate over time and I monitor it till it drops down to my normal FC target?

    My 2nd question is:
    Is it really necessary to get CYA down to around 50 or 60 OR will 70-80 be ok too?

    thx
    10k gal., Hydrozzo finish, in ground chlorine pool, No Spa, No Heater, Built in Oct 2012 TF-100 test kit Jandy Cartridge Filter CV340 Jandy VSFloPro Variable Speed Pump Model VS-FHP2.0 Hayward TigerShark QC Robotic Pool Cleaner RC9990GR Intermatic 100 watt Safety Transformer Model# PX 100 Intermatic Freeze Sentry PF 1202T.

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    Richard320's Avatar
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    Re: Getting FC down to target after slamming

    Chlorine breaks down in sunlight. So it will go down even if there is no algae left. Be patient.

    You can certainly keep the CYA high if you wish. You'll need to maintain a higher minimum FC level, but the actual bleach consumption will be pretty much the same. Pool School - Chlorine / CYA Chart Your higher minimum FC will preclude you from being able to use the OTO quick test for chlorine, though, since your minimum will be its maximum. You'll have to use the powder & drops every time.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad woodyp's Avatar
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    Re: Getting FC down to target after slamming

    In Houston? I'd say that FC will drop like a rock over two days!
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    Re: Getting FC down to target after slamming

    Ok, well then I'm going to shoot for a CYA of 50-60 so my FC target will be around 6-8.

    Ideally, I'd like CYA of 40 and FC 5-7.

    We'll see.

    Thanks everyone.
    10k gal., Hydrozzo finish, in ground chlorine pool, No Spa, No Heater, Built in Oct 2012 TF-100 test kit Jandy Cartridge Filter CV340 Jandy VSFloPro Variable Speed Pump Model VS-FHP2.0 Hayward TigerShark QC Robotic Pool Cleaner RC9990GR Intermatic 100 watt Safety Transformer Model# PX 100 Intermatic Freeze Sentry PF 1202T.

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    Re: Getting FC down to target after slamming

    Quote Originally Posted by martinspool View Post
    My 1st question is:
    Once I get my CYA down to normal levels, and there still is all this bleach in the pool from slamming, does it just evaporate over time and I monitor it till it drops down to my normal FC target?
    It will come down quickly. I just finished a slam this week. On Wednesday I was at FC 24 (mustard algae high shock level for CYA of 40) and today it was back down to 9 around lunchtime.

    15k in-ground plaster, Hayward C900 cartridge, 1.5hp Pentair SuperFlo VS pump, Hayward AQR15 SWG, Barracuda G2 suction cleaner, TF-100

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