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Thread: FC seems low

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    FC seems low

    Guys, running Aquapure 1400 with Jandy E-Pump @ 1750RPM for 4 hours a day (0630 - 1030). According to the Jandy calculator this is enough for one turnover per day. I'm running at 60% on the Aquapure controller, and my salinity is at 3.2.

    So when I test after the 4 hour run time (today tested 4 hours after run time ended 2:30) my FC was 1, maybe 1.5PPM. However when I turn the RPM up to 2750 in the evenings (when fountains and bubblers are on) and check again after swimming (2-3 hours) my FC reads 5-7PPM.

    What I'm trying to figure out is does RPM affect how much Chlorine is added to the water? I'm guessing the answer is yes, as more GPM are flowing therefore more Chlorine would be deposited...but I'm just looking to confirm.

    As well, for those of you whose pools are in full sun all day, how long do you need to run your SWG to maintain FC of 5-7PPM? Should I extend run time at 1750RPM for 8-10 hours? just trying to get this thing dialed in and I know all pools are differnt but looking for some ideas and starting points to accelarate the learning curve.

    Thanks as always
    18k gallon IG Sunstone Pearl pebble finish pool, Jandy Aquapure 1400 SWG, Jandy 1.5HP VS E-Pump, Jandy 60sqft DE filter, Jandy Legacy Propane Heater, Polaris 3900 Robotic Cleaner, TF-100 w/ SpeedStir, Anchor Mesh pool cover

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    Mod Squad jblizzle's Avatar
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    Re: FC seems low

    No the RPM does not affect the output of the SWG. If there is enough flow, then the SWG will generate at the % setting. BUT, if the flow is too low, the SWG will not generate at all (it should show a low flow light or something).

    Post up a full set of test results. Specifically, what is your CYA?
    Jason, TFP Moderator
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  3. Back To Top    #3

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    Re: FC seems low

    Results from yesterday

    FC 1.5
    CC 0
    TA 100
    PH 7.5
    CYA 60 - bringing this up slowly since we just added salt one week ago
    CH 220

    As mentioned, pool is in direct sun all day.....
    18k gallon IG Sunstone Pearl pebble finish pool, Jandy Aquapure 1400 SWG, Jandy 1.5HP VS E-Pump, Jandy 60sqft DE filter, Jandy Legacy Propane Heater, Polaris 3900 Robotic Cleaner, TF-100 w/ SpeedStir, Anchor Mesh pool cover

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    Re: FC seems low

    There is no way you are turning over 21k gallons at 1750 rpm in 4 hours. At that speed, I would guess you are getting somewhere around 25-40 GPM. Doing the math, that is less than 10k gallons turned over. I would suggest running the pump for 8-10 hours per day at 1750.
    28000 gallon IG pool, 3.5ft - 8ft deep, Stonescapes Tropics Blue Interior, Pentair Intellichlor SWG, Pentair Quad DE 100 filter, Pentair Intelliflo VS-SVRS, Whisperflo 3hp (water features), A&A Max in floor cleaning, Pentair Easytouch 8 Automation, Screenlogic II, Pentair Mastertemp 400k BTU heater, Pentair Intellichem with acid injection via stennar pump, 9'x7' spa with Infiniti edge

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    Mod Squad jblizzle's Avatar
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    Re: FC seems low

    turn over is meaningless. You need to run the pump long enough to filter out the dirt and keep the pool looking clean ... AND ... you need to set the SWG to maintain adequate FC. If it is not, then you should be adding bleach to make sure the FC does not drop too low until you get the SWG dialed in.

    See: How to Determine Pump Run Time
    Jason, TFP Moderator
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    Re: FC seems low

    Quote Originally Posted by jblizzle View Post
    turn over is meaningless. You need to run the pump long enough to filter out the dirt and keep the pool looking clean ... AND ... you need to set the SWG to maintain adequate FC. If it is not, then you should be adding bleach to make sure the FC does not drop too low until you get the SWG dialed in.

    See: How to Determine Pump Run Time
    Agreed - I was addressing the OPs reference to completing a full turnover in 4 hours. Regardless, I personally recommend an 8 hour run time, not just for filtration and allowing the Salt cell adequate time to produce chlorine, but also allowing the skimmers time to keep skimming the pool during the daylight hours.
    28000 gallon IG pool, 3.5ft - 8ft deep, Stonescapes Tropics Blue Interior, Pentair Intellichlor SWG, Pentair Quad DE 100 filter, Pentair Intelliflo VS-SVRS, Whisperflo 3hp (water features), A&A Max in floor cleaning, Pentair Easytouch 8 Automation, Screenlogic II, Pentair Mastertemp 400k BTU heater, Pentair Intellichem with acid injection via stennar pump, 9'x7' spa with Infiniti edge

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    Re: FC seems low

    I'm calculating that you are only adding 2 ounces of chlorine gas a day which equals .7 ppm of FC a day while you are running for only 4 hours with the SWG set to 60%.

    As Jblizzle stated the RPM does not matter as long as there is enough flow to not produce a "No Flow" error. The SWG will not make more chlorine on a higher speed.

    You need to increase the run time and/or the SWG% to make enough chlorine for the pools needs.

    The math for the SWG:

    Max chlorine output is 1.25lbs or 20 ounces of chlorine gas when the SWG is set to 100% and runs for 24 hours.
    4hrs/24hrs = .1667 for run time hours in a day
    60% setting = .6 for output of SWG
    20 X .6 X .1667 = 1.992 ounces of chlorine gas in a day
    Using PoolMath enter 21,000 gallons for your pool and enter 2 ounces of chlorine gas in effects of adding chemicals and you get .7 ppm of FC.
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    Mod Squad jblizzle's Avatar
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    Re: FC seems low

    Based on pings excellent math ... you need to likely triple that output.

    But being so low for now could mean you have algae growing. So using bleach to raise the FC and doing an OCLT would be a good first step to see if you now need to SLAM.
    Jason, TFP Moderator
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  9. Back To Top    #9

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    Re: FC seems low

    OK guys, thanks. I've switched to running 12 hours from 1030 PM to 1030 AM, any issue with running at night? Just seems to make sense when rates are cheaper (assuming rates are cheaper, I've not checked). I have kept the setting at 60% for now and will see where we end up tomorrow. I have/had been adding bleach when it got low, so it's only been in the 1-2ppm for the last day or so while I tried to rely on the SWG. Will check in the morning what it is and get back to you...as for SLAM, I'm heading on vacation on Sat so that's likely not an option before then but hopefully I can get the SWG to start raising the FC in the next day or two and then dial it back when we get home.

    For the record pool has been crystal clear for the 45 days we've had the pool, 35 of those using the TFTP method. Now just gotta get the SWG dialed in.

    Edit -
    Reread above and can/will do OCLT tomorrow night after seeing what FC is in morning after the 12 hour run time.
    18k gallon IG Sunstone Pearl pebble finish pool, Jandy Aquapure 1400 SWG, Jandy 1.5HP VS E-Pump, Jandy 60sqft DE filter, Jandy Legacy Propane Heater, Polaris 3900 Robotic Cleaner, TF-100 w/ SpeedStir, Anchor Mesh pool cover

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    Re: FC seems low

    Update, ran SWG @ 70% last night for 12 hours (only 10 so far, has 2 more left) and tested this morning...good news SWG works well. Drop Test = FC 11.5. So kicked % back to 60 and will see what that does tomorrow am.

    Also will test at end of day to see how much FC is loss due to sun, though it might be a cloudy day today.

    BTW, didn't see this answered....does it matter if you run the SWG for 12 hours at night vs daytime?
    18k gallon IG Sunstone Pearl pebble finish pool, Jandy Aquapure 1400 SWG, Jandy 1.5HP VS E-Pump, Jandy 60sqft DE filter, Jandy Legacy Propane Heater, Polaris 3900 Robotic Cleaner, TF-100 w/ SpeedStir, Anchor Mesh pool cover

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    Re: FC seems low

    We would recommend running at night as it gives the chlorine more time to work.

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    Re: FC seems low

    Quote Originally Posted by Abigail K View Post
    We would recommend running at night as it gives the chlorine more time to work.
    Or you could say run it during day since daytime is when you have chlorine usage.
    14000 gallon 16x32 roman in ground vinyl, Hayward 140k heat pump, swg, de filter 1 1\2 HP v.s. pump. Built in June 2014. Tf100 test kit.

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    Re: FC seems low

    FC this morning at 10.5, setting still 60% with 12 hour run time. I'm heading out of town tomorrow so think I will leave this alone and continue dialing in when I return, assuming the high FC won't do any damage for the week. Thoughts?
    18k gallon IG Sunstone Pearl pebble finish pool, Jandy Aquapure 1400 SWG, Jandy 1.5HP VS E-Pump, Jandy 60sqft DE filter, Jandy Legacy Propane Heater, Polaris 3900 Robotic Cleaner, TF-100 w/ SpeedStir, Anchor Mesh pool cover

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    Smykowski's Avatar
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    Re: FC seems low

    FC of 10.5 with CYA of 60 isn't high at all. For a manually chlorinated pool, that would be at the high end of normal. Basically all you're doing is over-running the pump and swg a bit, but he chemistry is plenty safe. Bottom line, I see nothing wrong with leaving it for the week and dialing it in when you get back.
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    Re: FC seems low

    It is safe, but not necessary. I target 5-6 for my FC since you don't have to keep FC as high with a SWG.

    I run my SWG for 12 hours at 80%. I'll be testing today, and I bet I have to raise that too.
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