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Thread: Is shocking necessary.........

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    Is shocking necessary.........

    Is shocking necessary if I maintain the clorine in the recommended range? Pool store man told me I need to shock at least once a week to actually kill the bacteria. My pool is crystal clear but now I wondering if it is full of bacteria?

    Thanks for your comments.

    Mark.

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    Mod Squad Bama Rambler's Avatar
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    Re: Is shocking necessary.........

    Do a search and you'll see that it isn't. I'm in a long line of people here that have never shocked their pool. Never needed to.
    Dave J. TFP Moderator
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    benavidescj's Avatar
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    Re: Is shocking necessary.........

    Nope, not necessary. I have never shocked mine. The only reason you need to shock is if you actually have organics in the water. The water will indicate this by not being clear, but most importantly the water testing you do will be your best indicator. If your CC test comes out greater than 0.5 it is an indicator that you have organics. Maintaining your chlorine level as recommended by this site will keep organics at bay and keep you safe. The pool store is just trying to sell you products.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Re: Is shocking necessary.........

    Disagree on this, and here is a decent link. In High temps and high humidity I shock weekly as it keeps chlorine from working as hard and I have zero issues or very low maint on chems in the Texas.

    http://www.learnaboutpools.com/poolshocks.html

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    Re: Is shocking necessary.........

    The site you reference appears to have a close relationship with the intheswim pool supply website.
    As such, I believe the information presented (specifically as it relates to "Shocking") is biased.
    Regular, accurate testing, along with following the basic principals detailed on this website truely can create a situation where shocking your pool is an infrequent (at best) activity.
    20'x40' / 30,000 Gal / In Ground / Vinyl
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    Re: Is shocking necessary.........

    Despite precab's opinion, the TFP philosophy is that if the level of FC is consistently maintained above the minimum for a given CYA level then shocking is rarely, if ever, necessary.

    The only time shocking is necessary is if:
    • You have algae[/*:m:2hyw1d8q]
    • CC > 0.5[/*:m:2hyw1d8q]
    • Overnight FC loss > 1.0[/*:m:2hyw1d8q]
    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 (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Mod Squad Bama Rambler's Avatar
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    Re: Is shocking necessary.........

    Quote Originally Posted by precab
    In High temps and high humidity I shock weekly as it keeps chlorine from working as hard ...
    There is no hard or not hard in how chlorine works. It works when there is something there for it to work on. It doesn't work less hard just because you add more once a week. I completely disagree with your statement.
    Dave J. TFP Moderator
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    Re: Is shocking necessary.........

    Here is a really good post on Chlorine and how it works:

    http://www.troublefreepool.com/chlor...it=chem%20geek

    Be prepared to get a headache if your not a chemist, although there is a tremendous amount of great information in it.
    24'x4' AGP Round
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    svenpup's Avatar
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    Re: Is shocking necessary.........

    I have the hardest working chlorine in show business...the James Brown of chlorine.
    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 (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: Is shocking necessary.........

    Quote Originally Posted by svenpup
    I have the hardest working chlorine in show business...the James Brown of chlorine.
    Need a rim-shot smiley!

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    Re: Is shocking necessary.........

    Quote Originally Posted by precab
    Disagree on this, and here is a decent link. In High temps and high humidity I shock weekly as it keeps chlorine from working as hard and I have zero issues or very low maint on chems in the Texas.

    http://www.learnaboutpools.com/poolshocks.html
    How does it "keep chlorine from working as hard"? What does that mean?

    Does the chlorine from the trichlor stand aside and let the chlorine from the cal-hypo jump in and do the work?
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Is shocking necessary.........

    Quote Originally Posted by 94ukgrad
    Is shocking necessary if I maintain the clorine in the recommended range? Pool store man told me I need to shock at least once a week to actually kill the bacteria. My pool is crystal clear but now I wondering if it is full of bacteria?

    Thanks for your comments.

    Mark.
    If you read here long enough you will find some very technical stuff about sanitizing pools. Mostly (as far as I can understand, not being a chemist) the bacteria is handled easily at low FC levels. However, when using pucks it is pretty easy to have FC go to zero since it is never very high. One big rainstorm with branches and dirt in the pool, one dusty dog swimming, one toddler, a few snotty kids, any of those can use up more than 3 ppm and so the typical pool running at 2 or 3 ppm is at ZERO pretty quick. So, with a weekly shock, for at least one day, you will know that FC was high enough to kill bacteria.

    I suspect that the reason they tell us that (I followed that advice also) is that if you use pucks exclusively for chlorination, the CYA level will get massively high really fast. If you use slightly less of the pucks, and add some cal-hypo type shock, then CYA rises but not as fast, and CH rises. Either of these can get too high and create big problems with algae explosions or calcium scaling. But the pool store is ready and willing to sell you additional products to solve those problems.

    It is rare to find a good test kit in a pool store it seems. Perhaps if you knew what the chemicals actually are, what they are for, and how they change, you could put into your pool what it needs when it needs it, no more and no less.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Is shocking necessary.........

    The same article linked above includes the following paragraphs (below). I would agree that it is factually incorrect and extremely biased. The author even misuses child safety as a theme to convince the reader. Little Plastic baggies of granular pool shock are more hazardous to small children (and pets) than heavy, child proof capped jugs of liquid chlorine!

    Quote Originally Posted by http://www.learnaboutpools.com/poolshocks.html
    Don’t use Liquid Shock!

    Another type of shock that is widely available at any local pool store, hardware store and many grocery stores is liquid chlorine. This liquid chlorine is commonly used as shock, and used in place of chlorine tablets. Many pool owners believe this liquid chlorine is all they need to properly maintain a swimming pool, and unfortunately this is incorrect. Liquid chlorine is very inefficient and costly compared to properly maintaining a swimming pool using chlorine tablets and a weekly shock treatment. Liquid shock may seem easier to use than the granular shock for some pool owners because you simply walk up to the pool and dump the liquid in. The problem is that after you dump the hazardous liquid in your pool, you have to dispose of all the empty plastic bottles with the dangerous chemical residue inside. Granular pool shock is packaged in small, easy to use 1 lb. bags. If any children have access to the area where pool chemicals are stored it will be far easier to have an accident involving full or empty bottles of liquid chlorine, than an accident with bags of granular pool shock.

    Granular Pool Shock is rated at a minimum of 47% available chlorine and available in concentrations up to 75%. If you look at the label on a bottle of liquid chlorine it will say that it is ONLY 10% SODIUM Hypochlorite (chlorine)!! This means you are paying for 90% salt water with every bottle you buy. The dosage for a standard granular pool shock is 1 lb. per 10,000 gallons of pool water. If you are currently using a liquid shock, you should compare the cost of a dose of liquid shock to the cost of a dose of granular pool shock. You will find that granular pool shock can offer you a considerable savings.
    33' above ground pool, 52" deep, about 27500 g
    sand filter w/zeobrite

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    Re: Is shocking necessary.........

    Quote Originally Posted by precab
    Disagree on this, and here is a decent link. In High temps and high humidity I shock weekly as it keeps chlorine from working as hard
    Do you even know what you're doing when you 'shock' your pool?

    Do you even know what SHOCK is?

    Shock is not a product, it's a process. The process is nothing more than raising the CHLORINE LEVEL HIGHER for a limited time.

    When you buy that product that says shock it's nothing but chlorine just concentrated.

    If you keep your chlorine levels where they are supposed to be to begin with, there is no need to shock...err.... add a HIGH dosage of chlorine.


    Quote Originally Posted by precab
    and I have zero issues or very low maint on chems in the Texas.
    So do the HUNDREDS of people on this forum who DON'T shock. Buy a good test kit and learn to use it and you'll rarely need to shock, if ever, your pool.
    24' x 52" AGP = 13.5k gallons
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    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    Re: Is shocking necessary.........

    Precab: how do you know you actually need that weekly shock? You may simply have a very high (but perhaps unnecessary) factor of safety. I understand your reluctance to not shock - if, for some reason, your pool is on the edge of algae outbreak, but you can't see it (or you don't have the test results for CC), you may not want to experiment, get an algae outbreak, then have to work harder to get ahead of it. On the other hand, you may be spending money on chemicals unnecessarily.

    If one doesn't have accurate test results, the CYA level is unknown, or if the pool liner and/or filter is harboring lingering algae and other organics, I can see why the overly conservative weekly shock approach is recommended. And, as pointed out throughout this web site, if they CYA level is very high (> 100, for example), then a whopping dose of chlorine may be necessary on a regular basis.

    I have been running our pool for over a month with only one elevated chlorine treatment - during the second week after opening , the chlorine level got to the low side for a couple of days, the water was becoming cloudy, and the CC was right at 0.5. I raised the chlorine level up to 12, and it gradually came down to 6 or 7 in a couple of days, water cleared up, CC is non-detectable, and chlorine is maintained between 3 and 5 (CYA about 40). I have operated the pool at the recommended FC range for the CYA level for more than 3 weeks, and through heavy bather load of 4th of July, 3 weeks of high humidity, +90 degree heat, and the water is crystal clear - no shock during this time.

    Anyway, that's my 2 cents-worth.
    25 K gal, vinyl, IG, next to forest,liquid chlorine and tab chlorinator backup,55gpm sand filter,1.5hp pump

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    svenpup's Avatar
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    Re: Is shocking necessary.........

    That "learnaboutpools" website is the anti-TFP. It looks like a company whose bread and butter is tabs & granular shock striking out against knowledge and common sense.

    I love how in their "don't use liquid shock" rant they refer to liquid shock as "hazardous liquid" but never mention that their products are also hazardous, and at the same time touting how much more concentrated their product is. Wouldn't that make their product more hazardous?
    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 (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Re: Is shocking necessary.........

    Ditto svenpup...

    I will add that liquid chlorine has been far less hazardous to work with for me. That automatic chlorinator is the most hazardous piece of equipment I've ever had the misfortune of using. You open up the lid to that thing and noxious permeating chlorine fumes overtook the area around you. My eyes stung, my lungs hurt, and no matter how long I tried to hold my breath, I still ended up choking on the fumes. I often ended up with swollen itchy eyes as well. Add to this the mixing in a bucket of powdered shock and it's no wonder I was fed up with my pool. So, no thank you. I will stick to LC. Even my liquidator doesn't smell like that chlorinator when I open it up.
    Backyard pool-less, but used to be.....
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    Re: Is shocking necessary.........

    Definitely in agreement with you svenpup and poolgirl22 - we still use the tablet chlorinator every so often to allow a few days of asbenteeism (would like to buy a Liquidator; perhaps next season), but we have to hold our breath to keep from choking on chlorine gas - same is true when opening the tab bucket.

    There's no "free lunch" with any method of sanitizing a pool - we had a SWCG for a few years and having to clean every couple of weeks with muriatic acid and adding acid to keep the pH down was no picnic. Just opening a bottle of muriatic acid on a warm, humid day can clear your sinuses for a week.
    25 K gal, vinyl, IG, next to forest,liquid chlorine and tab chlorinator backup,55gpm sand filter,1.5hp pump

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    Re: Is shocking necessary.........

    Quote Originally Posted by poolgirl22
    Ditto svenpup...

    I will add that liquid chlorine has been far less hazardous to work with for me. That automatic chlorinator is the most hazardous piece of equipment I've ever had the misfortune of using. You open up the lid to that thing and noxious permeating chlorine fumes overtook the area around you. My eyes stung, my lungs hurt, and no matter how long I tried to hold my breath, I still ended up choking on the fumes. I often ended up with swollen itchy eyes as well. Add to this the mixing in a bucket of powdered shock and it's no wonder I was fed up with my pool. So, no thank you. I will stick to LC. Even my liquidator doesn't smell like that chlorinator when I open it up.
    This is so true. I can't really complain about tablets because I used them successfully for many years but MAN-O-MAN, opening that thing up is dangerous!!!

    A couple of times I forgot to hold my breath and got my face too close to it and I thought my head was gonna explode. That can NOT be healthy.

    When I use 12.5% bleach (Liquid Chlorine) I can't smell a thing. And when the plastic jug is empty, I fill it with pool water a bunch of times and empty it into the pool...
    So when I throw it out, theres pretty much nothing in there at all.

    I started using bleach less than a week ago and am happy so far. But its a serious job right now constantly doing it. I might get a liquidator, or I might do a combination of bleach / tabs.
    Not sure yet.
    18x38 Inground Liner (25k gal) Paver surround, multi-speed pump, DE Filter, Raised spill over spa, TF-100

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    Re: Is shocking necessary.........

    The learnaboutpools.com website has a WHOIS registration using Domains by Proxy, Inc. so they are hiding their identity/ownership. The about page makes it sound like some pool owner put together the site, but virtually every link on the website that leaves the site goes to intheswim.com (as Jason noted [EDIT] CORRECTION: It was kenmar in this post [END-EDIT]). So this appears to be a lame attempt at deceptive marketing trying to pretend to just be a pool owner putting together info on swimming pools, but really it's an advertising site for a corporation.
    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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