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Thread: Target FC question

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    Target FC question

    So... All the reading I have done. I may have seen the answer many times but in different forms... but...

    Do you aim for Target FC constantly? Or do you get to the Target FC and let it drop through the day?

    Or do you aim above it, and let it drop to the target number?
    IG, 25k gallons, 20x40 ft, Plaster, Pentair sand filter, variable speed pump, have a well, TF-100 test kit, Speed Stir

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    Re: Target FC question

    During a SLAM, more than twice a day but less than every hour. During "normal" times, once a day is fine. If you are in the heat of summer with lots of sun and lots of bather load you would want to go a little over target to avoid falling below the minimum.
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    Re: Target FC question

    IANAC (I am not a chemist, and I'll certainly be lambasted for posting this but)

    In my opinion one of the reasons TFP works is because we keep the chlorine so darn high that algae never has a chance to get started.

    At a CYA of 50 my 18,000 gallon pool is currently going through 81 ounces of 8.25% chlorine a day to maintain a target of 6ppm.
    18k gal AG Sand Filter K-2006

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    Re: Target FC question

    I usually try to maintain the target... within 1 either direction.. 2, 3 year old toddlers running around don't allow me to always keep an eye on the pool chemicals so I will generally throw in a tad bit more chlorine that the calculator says and let it drift back down. Slightly over chlorinated is better that under chlorinated
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    Re: Target FC question

    Quote Originally Posted by Skitch View Post
    IANAC (I am not a chemist, and I'll certainly be lambasted for posting this but)

    In my opinion one of the reasons TFP works is because we keep the chlorine so darn high that algae never has a chance to get started.

    At a CYA of 50 my 18,000 gallon pool is currently going through 81 ounces of 8.25% chlorine a day to maintain a target of 6ppm.
    Actually, with the recommended CYA levels the actual active chlorine in a TFP pool is much less than a public pool with no CYA.

    Our philosophy is to give the pool only what it absolutely needs, in the minimal amount to be effective, chlorine included. We do not advocate anyone keep any level of chemical 'so darned high'.

    Dom
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    Re: Target FC question

    What is important is to never let FC drop below minimum or the pool will be unsanitary. To keep the pool properly sanitized maintain FC above minimum at all times. Add enough chlorine so that when you next test and add FC is above minimum. It is safe to swim up to shock level. Target is just a suggestion of a number that should keep you above min.
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    Re: Target FC question

    So if my target is 8 will this damage pool equipment quicker or is it not really 8 due to my higher CYA level? Maybe its a pool store myth but I recall them telling me that higher FC levels will damage or wear down your equipment quicker.
    13,500 gal in ground pool with pebble tec liner, intelliflow variable speed pump, cartridge filters, UV filter and solar heater.

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    Re: Target FC question

    Yep, that's pool store misinformation. The FC/CYA relationship is one most all pool stores don't have a clue about. The FC would have to be somewhere near 3x SLAM level to cause damage. "Target" is WELL below that.
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    Re: Target FC question

    Quote Originally Posted by texag99 View Post
    So if my target is 8 will this damage pool equipment quicker or is it not really 8 due to my higher CYA level? Maybe its a pool store myth but I recall them telling me that higher FC levels will damage or wear down your equipment quicker.
    No damage. There is a not-so-secret interaction between CYA and FC that has been published since the 1970s, where a FC level up to 16 with a CYA level of 40 is not a harmful level of chlorine. As you know this is 'off the charts' of what the pool store recommends, like on the test strips. I learned over 10 years that if I follow the test strip/pool store recommendations, my pool stays cloudy to the edge of green. Which is a fine color of water to swim in Gulf of Mexico beaches...

    CHAD
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    Re: Target FC question

    Quote Originally Posted by seedlings View Post
    I learned over 10 years that if I follow the test strip/pool store recommendations, my pool stays cloudy to the edge of green. Which is a fine color of water to swim in Gulf of Mexico beaches...

    CHAD
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