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Thread: Chlorine levels go down quickly is stabilizer inportant?

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    Join Date
    May 2017
    Silver Springs / Florida

    Chlorine levels go down quickly is stabilizer inportant?

    PH is high 7.8
    Stabilizer 0
    Water is clear but very hard to keep chlorine level in safe zone.
    What would you do?
    13500 gal in ground Marcite/Gunite pool, Cartrige filter Hayward brand filter and pump 1 HP. Water from Well Aqua test strips

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    borjis's Avatar
    Join Date
    Aug 2014
    Pacific NW

    Re: Chlorine levels go down quickly is stabilizer inportant?

    add 4lbs of stabilizer to get it around 40 (my pool roughly same size as yours)

    The cya will bring down your ph a bit too, so don't bring that down yet.

    edit: just noticed your using guess strips (test strips are just not very accurate)

    you need a TF100 or Taylor K2006C test kit to get proper test results before you do anything.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Chlorine levels go down quickly is stabilizer inportant?

    Welcome to TFP!

    Yes, stabilizer protects chlorine from the sun. It is also known as cyanuric acid or CYA for short. You want to have 50 ppm of CYA for your sunny location. PH at 7.8 is fine. More here about how to add CYA to your pool, Pool School - Recommended Pool Chemicals

    Do some reading here, ABCs of Pool Water Chemistry And here, Pool School - Getting Started

    Edit: or 40 for CYA is fine to start with.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Chlorine levels go down quickly is stabilizer inportant?

    Without any stabilizer in the pool water, the half-life of chlorine is about 35mins give or take. So, in a little over four hours of direct noon time sun, you will lose 94% of the chlorine in your pool. SO the answer to your question is - yes, stabilizer is very important.
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    'burbs of Augusta, Georgia

    Re: Chlorine levels go down quickly is stabilizer inportant?

    How have you managed in sunny FL up to this point to keep your pool algae free? Or perhaps haven't? How does your water look?

    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Skippy's Pool Cooler --> Skippy's New Fountain Our Build --> Our Pool Solved Our Sloping Yard

  6. Back To Top    #6

    Join Date
    Mar 2008
    Los Angeles, Ca

    Re: Chlorine levels go down quickly is stabilizer inportant?

    Recommended test kit here

    BTW, the magnetic stirrer makes it so much easier to test with. Highly recommend when you get the kit.
    25,000 gal fiberglass pool, Raypak 336k BTU low nox RP 2100 gas heater, Pentair CCP520 520 sq ft Cart filter, Max-Flo VS2303VSP pump, diy control and automation system

    seperate spa, with own pump, cartridge filter, Hayward H200FDN heater, diy control and automation system

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