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Thread: Phosphates & Shocking the water with a fiberglass pool?

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    Phosphates & Shocking the water with a fiberglass pool?

    I found this forum a few days ago and have been reading quite a bit. Like many others, I have thought that phosphates have been my big problem in trying to maintain chlorine in my pool. I have had my pool for almost ten years now and have always fought the chlorine levels after the first year I had it. The SWG will not generate chlorine. I've replaced the entire system twice. I very rarely have any free chlorine in the water etc. I have always had high phosphates levels in my pool and the local pool store always told me that was my problem.

    My pool has sat empty for the last year as I have been and I finally filled it back up about a month ago, but instead of using my house water or having it filled, I pumped water in from my pond. So far, I have been able to easily maintain the proper chemical levels and have 0 phosphates in the water. But after reading this forum, I'm wondering if the phosphates were ever my real problem. When ever I shocked my pool, I usually would put in 2 or 3 gallons of liquid chlorine and let it sit for 24 hours with the pump running. It seems like this is my major problem as I never had enough chlorine in the water and is why I always had so many problems with the pool.

    From what I've been reading though, that is not how to properly shock the pool, although with the fiberglass pool, if I properly shocked it, wouldn't it burn the pool? I already have problems with chlorine burning the pool with the way I was previously shocking it. Any recommendations on how to shock the pool and not burn the fiberglass? As I sit right now, I want to continue filling the pool with pond water instead of using my house water because I know it contains high phosphates. With all the problems I had before it's hard to want to risk filling/topping it off with house water when I have had so many problems in the past.
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    dmanb2b's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Welcome to TFP...shocking your pool will not burn your fiberglass. The key to pool water maintence is owing your own quality test kit. Even high phosphates are not an issue if your chemical levels are properly maintained. The first step would be to get a reliable set of pool water test results, post them here and we can steer you in the right direction.

    Results needed are

    FC
    CC
    PH
    TA
    CH
    CYA

    the above result accronyms are explained here in pool school http://www.troublefreepool.com/pool-..._abbreviations

    I strongly suggest you visit pool school...button on top right of the webpage.

    Welcome again.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Welcome to TFP!

    Ignore any phosphate advice. There are prominent members of this forum who have run with documented heavy phosphate loads in their pool water and experience no problems with this. It's a sales pitch more or less.

    Your original suspicion of not having enough chlorine in the pool is the most likely thing. If you run the tests that dmanb2b suggested and post them here, we will get you moving in the right direction.
    10K gallon IG gunite with waterfall; Pentair CC320P filter; WhisperFlo 2 HP pump
    TF Test Kits - Pool Math - Pool School
    "It depends."- JohnT

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    dmanb2b's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    also...as far as recommended test kits, I would suggest either the TF-100 from TFtestkits.net or the taylor k2006. Spending $70 on a test kit may seem pricey, but it is well worth the investment to avoid wasting money at the pool store and peice of mind...IMHO
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

    Pool School, TFTestKits, Pool Calculator

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    I already have TF100 kit on order. As soon as it comes in I will be posting my results. Is there anything else that can burn the pool? My spa burns fairly easily and I know I havn't run heavy amounts of chlorine through it.
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Teeseee 150...could you describe the burn stains a little more. is it possible you have metal stains?? Fiberglass will show metal stains very easily especially if the ph is kept high. A picture would help if not try to explain the burn marks in detail.

    Also what is the hot tub made of??
    Ric W
    My Pool
    8605 gal fiberglass, 3/4 hp pump, sand filter, aquabot cleaner, heat siphon heat pump, tiger river(sumatran) spa

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    frustratedpoolmom's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Ric - I think you're on to something ...

    Teeseee-
    Pool surfaces don't "burn". Are you seeing orange-brownish staining below the water line, kinda rusty looking?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Quote Originally Posted by frustratedpoolmom
    Ric - I think you're on to something ...

    Teeseee-
    Pool surfaces don't "burn". Are you seeing orange-brownish staining below the water line, kinda rusty looking?

    This is what I'm seeing. It's a light brownish color. I mostly see it in my spa. When my filter pump runs, it dumps about 1/2 the water back into the spa and then overflows into the pool. I do see some of this coloring on the pool, but its mostly where the water dumps back into the pool.

    The spa is made of fiberglass as well as the pool.

    I also expect to have the TF100 kit here tomorrow. I'll post up the results as soon as I get a chance.
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    JasonLion's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Try holding a vitamin C tablet against one of the stained areas for 30 seconds and see what happens.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    frustratedpoolmom's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Yes, that sounds like iron staining. The vitamin c tablet as Jason suggested will confirm or rule it out.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    I put the Vitamin C tablet on the stain and it did go away. Does this confirm the iron staining?

    Hopefully I'll be posting test results tomorrow from the TF100 kit.
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    JasonLion's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Yes, that means those are iron stains.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    frustratedpoolmom's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    You should read this article and consider doing the AA treatment to get rid of the stains.
    http://www.troublefreepool.com/pool-...metal%20stains
    However, if its going to be warm where you are, it might be better to wait until the weather cools to reduce the risk of an algae bloom, as the treatment requires essentially zero chlorine in the water. If you do decide to do the treatment, be sure to use polyquat 60 algaecide.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Quote Originally Posted by frustratedpoolmom
    You should read this article and consider doing the AA treatment to get rid of the stains.
    http://www.troublefreepool.com/pool-...metal%20stains
    However, if its going to be warm where you are, it might be better to wait until the weather cools to reduce the risk of an algae bloom, as the treatment requires essentially zero chlorine in the water. If you do decide to do the treatment, be sure to use polyquat 60 algaecide.
    The pool is an indoor pool. I keep the room around 70*F. I'll take a look at the AA treatment. Thanks for the info. Everything posted so far has been a HUGE help.

    I also got the TF100 kit in today and will be testing the water when I get home from work.
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    frustratedpoolmom's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Now would be a good time to put your pool specs and equipment into your signature - go to User Control Panel, then Profile, then Edit Signature.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    My test results were the following:

    The kit in the blue case:
    Cl - 2
    Br - 4
    Ph - 7.5

    Drop based tests from TF100
    Free Chlorine - 2
    Combined Chlorine - 1
    Total Alkalinity - 160
    CYA - <20 (filled the tube to the top and could still see the black dot)
    Indoor 20K gallon fiberglass. Fiberglass Spa. Hayward Sand Filter. Triton 250M Plus Millivolt heater. Jandy Aqualink RS8 control panel

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    frustratedpoolmom's Avatar
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    Re: Phosphates & Shocking the water with a fiberglass pool?

    If your CC is 1 it means you need to shock the pool. (ignore the BR reference in the blue box chlorine test).

    Read:
    Shocking Your Pool
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    teesee150,
    I also have an indoor fiberglass pool and have never been able to get rid of the brown iron stains. Please post here if you have any luck.
    PS. I've tried tons of ProTeam Metal Magic with no luck. The vitamin C tabs do work but I can't do that to the whole pool
    21,000 gal Fiberglass (Indoor)

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Quote Originally Posted by andy
    teesee150,
    I also have an indoor fiberglass pool and have never been able to get rid of the brown iron stains. Please post here if you have any luck.
    PS. I've tried tons of ProTeam Metal Magic with no luck. The vitamin C tabs do work but I can't do that to the whole pool
    Metal magic is not for removing stains, but for keeping the metals suspended in the water and not deposited on your pool (which is basically what the staining is)
    The Vitamin C treatment does work, although not one tablet at a time!! It is called an Ascorbic Acid treatment and you can find out about it here.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    Re: Phosphates & Shocking the water with a fiberglass pool?

    Sorry, not trying to hi-jack this thread but this question should help the original poster also.
    I've read the link/post on AA and will give that a try but how much AA do I need to add each attempt? 1lb per 10,000 gal? more? less?....
    21,000 gal Fiberglass (Indoor)

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