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Thread: chlorine levels

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    chlorine levels

    I have an above ground intex pool (3800 gal) with a SWG. I have had it for about 1 month now and havn't had any trouble maintaining the levels. Now, my chloring keeps reading <1. My SWG runs for 5 hours and shows no indications of problems. I have also added bleach recently. The CYA levels are reading normal, but I don't know why the chlorine level is so low. Any suggestions?

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    svenpup's Avatar
    Join Date
    Nov 2009
    Sacramento, CA

    Re: chlorine levels

    It is hard to say without a full set of readings (FC, CC, CYA).

    My guess is that the FC went below minimum for your CYA and you now have a low level of algae. This causes the biological chlorine demand to exceed what your SWCG is generating so your FC is always low.

    I recommend shocking with liquid chlorine (bleach) per the pool school shocking instructions (link in my signature) to get ahead of the algae, after which your SWCG will again be able to keep up with the chlorine demand.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock ('s a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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