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Thread: Can't keep FC Level. (New at Pools)

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    Can't keep FC Level. (New at Pools)

    I moved into a house with an existing pool.
    24 ft Round x 48"
    Hayward Sand Filter

    When opening for the season and not knowing anything about pools, I guessed at what to do. The pool was dark in algae. I called a local pool shop and was told to just use shock and algaecide. I went to Walmart and looked at what they had to offer. I purchased 2 1 lb bags of shock and a bottle of algaecide that was suppose to be enough for my pool. The water cleared to a cloudy aqua color. I cleared the pool of leaves and debris and let the filter run for several days. I also added chlorine pucks. The water never cleared from the cloudy aqua color.

    I then ran across your site and started reading about using bleach. I already had purchased test strips so I tested the water. And got approx the following results ( can't remember exactly now)

    Total Hardness 250
    Total Chlorine 0
    Free Chlorine 0
    pH 7.4
    Total Alkalinity 120
    CYA 100

    I wanted to get the CYA down so I drained about 1/3 to 1/2 of the pool which brought the CYA to 30-50
    I then used the PoolMath Calculator to find out how much bleach to add. I now had algae again, so I went by the FC value for algae, which was to raise FC to 24, to do this I needed to add 4 gallon and 3 quarts of bleach. I did so and the FC came up to above 20 (highest test strips will measure). I left the filter running, the water turned back to the cloudy aqua color in a few hours. The next evening (24 hrs later) the FC was 0 again.

    I used the PoolMath Calculator again to get the FC to 3 and it said to add 1 quart 1 cup of bleach, I did so but the chlorine levels didn't rise at all they stayed at 0

    What am I doing wrong, any help will be appreciated. I have put so much money in this I can't afford to buy a good drops test kit at this time so I hope the strips will do

    Levels now

    Total Hardness 250
    Total Chlorine 0
    FC 0
    pH 7.2
    Total Alkalinity 120
    CYA 30-50

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    Smykowski's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    Quote Originally Posted by Leejohnson1959 View Post
    What am I doing wrong, any help will be appreciated. I have put so much money in this I can't afford to buy a good drops test kit at this time so I hope the strips will do
    Welcome to the forum!

    Unfortunately, you answered your own question. It's pretty much impossible to do it our way without your own good test kit. The money you will save in the long run by not spinning your wheels and by buying only what you need will be substantial, so you really need to look at it as an investment that will pay dividends far into the future (see my signature for a real life example).
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Can't keep FC Level. (New at Pools)

    The fasdpd test kit is critical to maintaining good water quality and clearing your pool. It will more than pay for itself many times over. With the proper test kit and following the Slam process as described in pool school, you will be successful.

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    Re: Can't keep FC Level. (New at Pools)

    Quote Originally Posted by JamesW View Post
    The fasdpd test kit is critical to maintaining good water quality and clearing your pool. It will more than pay for itself many times over. With the proper test kit and following the Slam process as described in pool school, you will be successful.
    I can't afford a test kit and chemicals at the same time till July. By that time the pool will be back to the way it was. Thanks for your advice, but I guess I'm out of luck.

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    Re: Can't keep FC Level. (New at Pools)

    One more question....do I need to get it where there is a FC level of 3 ppm 24 hrs a day or just when done swimming?

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    Smykowski's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    If the CYA is 40, you need to maintain an FC at or above 3 at all times.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    frustratedpoolmom's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    What are you doing wrong? You're not following the SLAM process, with or without a test kit. You are letting the FC drop down too low in between testing and additions. You want to hold it at shock level until the water is clear - not cloudy. 3 is not nearly high enough. So what you added, was consumed instantly, because you have something organic in your pool consuming the chlorine as you add it. That's why you're not getting a reading - even on the strips. You need to add chlorine, up to shock level, testing and adding up to every 30 minutes, until you reach shock level. Since you can't read that on the strips - it's almost going to be impossible. But letting it drop down won't help you either. Try Diluting with 3 parts distilled/bottled water to 1 part pool water. Mix together then test the water with that. Multiply by 4 to get your result. You lose some accurace but it's worth a shot. Shock level according to CYA chart is 39. Not 24. If you want to try and clear the pool - that's what I'd suggest rather than waste what money you have spent so far and give up till July.

    I hope this helps. Post back if you need me to clarify anything...
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Smykowski's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    FPM is right. My response is where the FC needs to be once the pool is clean. You need the SLAM the pool to get to that point.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Can't keep FC Level. (New at Pools)

    I just found out about the slam process today. I am willing to try that, I don't know where you are getting the shock level of 39. I used the pool calculator and it says shock is 16 and algae is 24. Can you explain where the 39 comes from

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    Smykowski's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    You need to populate the CYA "Now" field for that blue information bar to read correctly.

    If CYA is 100, shock level is 39.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Can't keep FC Level. (New at Pools)

    Quote Originally Posted by Smykowski View Post
    You need to populate the CYA "Now" field for that blue information bar to read correctly.

    If CYA is 100, shock level is 39.
    My CYA now after replacing 1/3 to 1/2 the water is at 40

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    Re: Can't keep FC Level. (New at Pools)

    Are you using PoolMath?
    Jason, TFP Moderator
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    Re: Can't keep FC Level. (New at Pools)

    Quote Originally Posted by jblizzle View Post
    Are you using PoolMath?
    Yes I am using Pool Math. Do I use the shock value or the algae value. The shock shows 16 and the algae shows 24. I did 24 first. Then tonight I done 16 because I was out of bleach

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    Re: Can't keep FC Level. (New at Pools)

    Quote Originally Posted by Leejohnson1959 View Post
    Yes I am using Pool Math. Do I use the shock value or the algae value. The shock shows 16 and the algae shows 24. I did 24 first. Then tonight I done 16 because I was out of bleach
    Do you have mustard algae? SLAM level for MUSTARD algae is 24. Otherwise it is 16 for a CYA of 40.

    Can one of the experts please confirm?
    14K Gallon IG Gunite Pool built in 2005, Century Centurion 1 1/2 HP Pump
    Pentair Clean & Clear 420 Sqft. Cartridge filter, MiniMax Pentair NT Heater, The Pool Cleaner
    Taylor K-2005 test kit with Taylor K-1515-A FAS-DPD Chlorine Test. SpeedStir

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    Re: Can't keep FC Level. (New at Pools)

    I don't think I have algae now. When I used the 24 value I had a yellowish green algae. Not sure if it's mustard algae



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    frustratedpoolmom's Avatar
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    Re: Can't keep FC Level. (New at Pools)

    You most likely don't have mustard algae, a very common misconception. I missed the comment about the partial drain. Your shock level is 16. So that will be easier to use the dilution method... do equal parts pool water and bottled water and multiply by 2. You can read up to 20 that way... can help keep you on target. Remember, ignore if your PH is reading high - it's a false high that will drop when the FC drops back down to normal.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Can't keep FC Level. (New at Pools)

    What test are we talking about here?

    Quote Originally Posted by frustratedpoolmom View Post
    ... Your shock level is 16. So that will be easier to use the dilution method... do equal parts pool water and bottled water and multiply by 2. You can read up to 20 that way... can help keep you on target. Remember, ignore if your PH is reading high - it's a false high that will drop when the FC drops back down to normal.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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