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Thread: FAS/DPD test results

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    FAS/DPD test results

    So I got my K1515A test kit today. First test results are FC of 9 and CC of 0. Pretty high, so since salt cell output was at 60%, I cut it down to 50%. What should be my timeframe to wait before I retest the see where I'm at? Theoretically a day of good sunshine, right?
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    pwrstrk's Avatar
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    Re: FAS/DPD test results

    Yep I'd give it a day of full sun. That'll give a good indication of where you stand. What's your CYA level so your sure to stay in range for it ? 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: FAS/DPD test results

    45 ppm
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    pwrstrk's Avatar
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    FAS/DPD test results

    Quote Originally Posted by eqbob View Post
    45 ppm
    You should bump that up a bit. For a SWG we recommend a CYA level of 70-80. You'll get better protection from the sun at those levels. Your target FC would then be 5-6 respectively and never below 3-4 respectively. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: FAS/DPD test results

    Yes. It's lower than what's recommended. The CYA/Chlorine relationship is (in my opinion) the hardest one to understand...not follow, but understand. I've been reading the posts on this subjct, occasionally asking questions, and learning. I am not likely to blindly follow recommendations without understanding their basis. ChemGeek's recent posts in another thread offered some nice clarity about what this relationship is really there for and the equilibrium aspect of the process. Has helped the understanding a good deal.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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    pwrstrk's Avatar
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    Re: FAS/DPD test results

    Yes the FC/CYA relationship is very important. It sets the FC range for the CYA level to prevent algae. Believe in it as it works !! 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: FAS/DPD test results

    Well, that's not the only reason. I've saved several snippets of threads to re-read, mostly from ChemGeek. I don't recal if this one was from him or not, but.....

    "This is the main reason to have a high CYA level for outdoor SWG pools in order to reduce chlorine usage so that the SWG on-time can be lowered which results in a slower rate of pH rise (possibly due to less aeration and less undissolved chlorine gas outgassing)."

    Many recent posts threads have documented that the amount of FC that is truly active and therefore available to fight anything is a very low percentage of overall total FC.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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