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Thread: Safe to swim ??

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    Safe to swim ??

    Just wondering what you guys think is a safe time frame to allow swimming after adding bleach to pool. I pour the bleach slowly over a return in the deep end. It has a strong output flow and the bleach appears to dissipate rapidly into the pool. I am wanting to add 2 gallons of 6%, but company is on the way and I dont want any issues with the bleach.
    16x32 IG vinyl
    24000 gallons
    Hayward super pump 1.5HP
    Hayward Pro Series Filter S244T
    3 returns, bottom drain, skimmer

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    poolhound's Avatar
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    If this is just a maintenance dose (will not raise FC to shock levels) you can jump in as soon as your done pouring. I would spread my pour among all your returns to get quicker distribution.
    24000gal IG, VL, 1.5 HP, Pentair 60/60D Sand 325#, BBB, Liquidator, Dolphin M400

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    2 gal will add 5ppm to your pool....swim away.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    So at what ppm would it be unsafe to swim? I did not let the kids swim today because we were at 8 ppm FC.

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    This brings up a question I have as well...

    CYA ........... Min FC3 ..... Target FC ...... Yel/Mstrd Min ...... Shock FC ..... Yel/MstrdShock
    70 ............... 5.1 ............... 8.0 .................. 10.5 ................... 27.52 ............... 40.52

    According to the Chlorine to CYA chart, a CYA of 70 means the target FC should be 8 ppm but what would be the max FC safe to swim in? Can you swim in shock level 27.52ppm? how about the yel/mstrd min level?
    36,000 gallon IG Gunite (40 x 20), 1.5 HP Hayward pump, Pentair Nautilus NS-48 DE filter, 2 skimmers, 12 - (2 x 20) Fafco Solar Panels (Goldline controller not hooked up yet), Hayward Swimpure Plus SWG, Blue Pearl Robot cleaner. New Dr. Wellness X-12 standalone Lifestyle Spa.

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    JasonLion's Avatar
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    There isn't a clear sharp line of "this is safe and that isn't", people disagree on where to draw the line. Public indoor swimming pools sometimes have amazingly high active chlorine levels, nothing you would ever see with a CYA of 70. At those levels there can be damage to hair, bathing suits, and possibly accelerated corrosion of metals, but people do swim at those levels.

    Personally, I feel that anything below shock level is alright. But other people set their line higher or lower than that.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    One more question along these lines. How long should I wait to test chemical levels after I put liquid bleach in the pool. I have a good flow rate in my pool. I am concerned that testing too soon will skew the numbers. As a side just ordered the TF-100 and am looking forward to getting this BBB down pat!!
    16x32 IG vinyl
    24000 gallons
    Hayward super pump 1.5HP
    Hayward Pro Series Filter S244T
    3 returns, bottom drain, skimmer

  8. Back To Top    #8

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    I would think that depends on many different factors like what is your pump capacity and how long does it take to completely recirc the entire pool. Most pool pumps are sized to recirc a pool in 8-12 hours but some may take 24 hours. I would take this into consideration as well as where are you sampling and where are your return lines. Ideally waiting for the pool to completely recirc would be best but in cases like FC it may be already vastly different several hours later. I usually add chlorine during the evening and wait at least a couple of hours to test (which is pretty sufficient recirc time). I also have a robot and sometimes run it as well which takes about 2.5 hours. After that my pool is pretty much mixed.

    I usually test for PH and FC at night and in the morning. I've had previous problems with algae so I like to check if FC is being consumed at night. Whatever you do, consistency is key. You may want to add chemicals at night and test in the morning or vice versa. You also want to test in the same area of the pool or several multiple areas of the pool. Just stay consistent so you will notice trends.
    36,000 gallon IG Gunite (40 x 20), 1.5 HP Hayward pump, Pentair Nautilus NS-48 DE filter, 2 skimmers, 12 - (2 x 20) Fafco Solar Panels (Goldline controller not hooked up yet), Hayward Swimpure Plus SWG, Blue Pearl Robot cleaner. New Dr. Wellness X-12 standalone Lifestyle Spa.

  9. Back To Top    #9

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    Most pool chemicals once dissolved in water mix rather quickly. The main exceptions are thick chemicals such as PolyQuat algaecide or some clarifiers. It does not take one turnover to mix the pool water thoroughly -- circulation through the filter vs. mixing of the water are different though related things.

    I've done tests in my 16,000 gallon pool using a pool dye (GLB Party Blue) and also testing FC levels at one end of the pool after adding chlorine at the deep end over a return flow (at around 48 GPM distributed through 3 returns, so around 16 GPM each). Most of the chemical was dispersed and measured at the other end after only 10 minutes, though continued increases were seen to around 20 minutes and after 30 minutes I would say it was effectively thoroughly mixed. So in a pool with decent circulation and the pump running, it doesn't take long.

    Richard
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  10. Back To Top    #10

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    Very good info... Thx
    36,000 gallon IG Gunite (40 x 20), 1.5 HP Hayward pump, Pentair Nautilus NS-48 DE filter, 2 skimmers, 12 - (2 x 20) Fafco Solar Panels (Goldline controller not hooked up yet), Hayward Swimpure Plus SWG, Blue Pearl Robot cleaner. New Dr. Wellness X-12 standalone Lifestyle Spa.

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