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Thread: Giving up Chlorine Tabs cold turkey

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    Giving up Chlorine Tabs cold turkey

    My pool was finished in October of 2015, for the past 16 months I have been using chlorine tabs and other chlorine shock treatments that have sky-rocketed my CYA levels. I have not had any major problems. Water has always been blue. (just some small algae blooms that brushed off the pebble tech and a little calcium scaling) but i have decided to completely stop the tabs per this website and switch to bleach. I have been using bleach for a week and I just received my test kit and recorded the following results. I was trying to get the FC up since my CYA has been high. I did all the tests twice to confirm.

    FC 7.5
    TC 7.5
    PH 7.5
    CH 575
    TA 140
    CYA 120

    I have used a local pool store to test in the past and my CH and TA never seemed to be off. CYA has always been high which is what brought me here. Any advice to get me leveled out would be appreciated. Thanks
    21K gallons, IG with Pebble Tech, hayward cartridge, Oct 2015 install with spa, TF-100 w/speed stir

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    Mod Squad Texas Splash's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Hello and welcome to TFP! Great job on the TF-100. Now you see accurately what's happening. No doubt the CYA needs to be lowered. If I were you, I'd do a partial water exchange which is the only way to lower CYA. Easy math - if you swapped-out 1/2 of the water, that would lower CYA to about 60. That's good for summer if your pool gets full sun. We've had a bit of rain lately, so you don't want to lower your water level too much at any one time due to a possible raising water table. But the ideal goal would be to get the CYA down to about 50-60 before you do anything else. The bonus in this is that it may lower your CH a little as well if in the past you used any cal-hypo pool store products.

    Once you lower the CYA, re-evaluate the water and any possibility of algae. If you need to "SLAM" to eliminate algae, that's the time to do it, after exchanging the water. Hope that helps answer your question.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Giving up Chlorine Tabs cold turkey

    I might want to test your fill water. Post those results so we know what you are working with as far as TA and CH from there.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Mod Squad pooldv's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Welcome to TFP!
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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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    Mod Squad kimkats's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    You have come to the right place to save you some money and keep your plaster in great shape for a long time!

    The above people have told you the best things to do. Listen to them and ask LOTS of questions!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Giving up Chlorine Tabs cold turkey

    Fill water CH 225 and TA 120. FC and CYA 0

    - - - Updated - - -

    Thanks for the advice. What is the easiest way to drain the pool?

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    Mod Squad woodyp's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Does your pool have a bottom drain? You can either buy or rent a small sump pump.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Jedisparky's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    So I've been seeing this a lot here: Clorox bleach works fine instead of "shock" (I guess that's bleach?) and the Clorox won't raise your CYA as where the Shock bleach will? Is that an accurate statement?

    Loc: So Cal Full Sunlight, IG 30'x15' Rectangle, 21,000gal w/ 2100gal Jac w/ Spillover
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    Mod Squad tim5055's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Quote Originally Posted by Jedisparky View Post
    So I've been seeing this a lot here: Clorox bleach works fine instead of "shock" (I guess that's bleach?) and the Clorox won't raise your CYA as where the Shock bleach will? Is that an accurate statement?

    Sent from my 2PS64 using Tapatalk
    No, liquid "shock" is nothing more than higher % bleach. It has no CYA
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    Mod Squad pooldv's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Yep, bleach, liquid chlorine and liquid "shock" are all exactly the same thing with different percentages. They are all sodium hypochlorite. Bleach is usually 6-8.25%, liquid chlorine is usually 10% and liquid "shock" is usually 12.5%.
    TFP Moderator
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    Mod Squad YippeeSkippy's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Stores sell a lot of products called "Shock"....there is no one product by that name so it may be liquid or granular. It may be nothing more than chlorine, or it could also include calcium or CYA. You can never tell unless you read the ingredients.

    Household plain, unscented, normal indoor use bleach is nothing but liquid chlorine at about 8.25%. That is the ideal product unless you can find a higher % of liquid chlorine at a pool store. Just make sure it has no other ingredient in it.

    PoolMath can advise you on how much to use for particular needs based on the % you input into the program. It can compute them all!

    Yip
    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

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    Jedisparky's Avatar
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    Re: Giving up Chlorine Tabs cold turkey

    Nice, thx!

    Loc: So Cal Full Sunlight, IG 30'x15' Rectangle, 21,000gal w/ 2100gal Jac w/ Spillover
    (SWG) Pentair Intelli IC40, Pentair Intelliflo Variable Speed UEE Pump
    Pentair Mastertemp 400 Pool and Spa Heater
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    Intellibright 5G Color Pool and Spa Lights, Hayward Nav Pro Pool Vac, Taylor-2006

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    Re: Giving up Chlorine Tabs cold turkey

    I did approximately a 60 percent water replacement. Here are my new numbers. Was hoping the CYA would drop more. The CH did come down a bunch though. I'm in Houston so it's about to get really hot. What should I do now?

    New numbers...
    FC 2.5
    Cc 1
    Tc 3.5
    Cal hard 375
    Alkalinity 150
    Cya 90

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    Re: Giving up Chlorine Tabs cold turkey

    Above 100, the CYA test isn't always incredibly accurate. Can you perform one more drain of about 1/3rd of the water?
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
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    Kreepy Krauly Cruiser, TF-100 with SpeedStir. :D

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