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Thread: Which Chlorine/CYA to go by??

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    Which Chlorine/CYA to go by??

    I've been going by Ben's Best Guess Chart for my shock level and FC but then today i discovered the troublefreepool chart and it shows something different, so which is best to go by??

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Which Chlorine/CYA to go by??

    If you stay on TFP, responders will assume you are using our guidelines.

    Don't try to bounce back and get stuck in the middle and it will cause a lot of confusion.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Which Chlorine/CYA to go by??

    Ok thanks for clearing that up but my only concern is the TFP chart says my shock level should 14 ppm higher than bens chart so i'd have to spend more money buying 5 more gallons of bleach if i go buy TFP's chart so im not sure which one is more accurate

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Which Chlorine/CYA to go by??

    It's not a matter of accurate, but of speed. A higher chlorine level will kill the algae more quickly and oxidize chemicals more quickly. The TFP chart is set so that there is the same active chlorine level at all CYA levels. Ben's chart was done more from experience than from calculations so varies from this. You can certainly use lower numbers for shocking, but it will take somewhat longer. Once the algae is dead, most of the time of clearing a pool is with circulation/filtration to remove the dead algae.
    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"

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    Re: Which Chlorine/CYA to go by??

    This was the explanation i was looking for thanks a lot, im going to use TFP's chart from now on

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