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Thread: Store says Increase CH in vinyl pool

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    Store says Increase CH in vinyl pool

    I have a vinyl pool my calcium hardness is only 70 I am being told to raise it because ideal 200 -400 and min.is 100 . they say if you don't it will eat up my ladders and any parts of metal in the pool is that correct. can anyone give the truth.

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    Mod Squad JVTrain's Avatar
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    Re: Store says Increase CH in vinyl pool

    Quote Originally Posted by brundel View Post
    I have a vinyl pool my calcium hardness is only 70 I am being told to raise it because ideal 200 -400 and min.is 100 . they say if you don't it will eat up my ladders and any parts of metal in the pool is that correct. can anyone give the truth.
    For vinyl pools, CH is largely irrelevant. 50 to 350 is fine for a vinyl pool, even higher is fine too. Lies, lies and ****ed lies. No reason to raise your CH.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Mod Squad jblizzle's Avatar
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    Re: Store says Increase CH in vinyl pool

    They do not know what they are talking about. Your CH is fine.
    Jason, TFP Moderator
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    JoyfulNoise's Avatar
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    Re: Store says Increase CH in vinyl pool

    Calcium hardness and the various saturation indices that are calculated using CH values (CSI and LSI) have absolutely nothing to do with metal corrosion. See this thread for a very detailed discussion. This is the money-quote (emphasis and abridgment added for brevity) -

    These indices do nothing more than predict saturation of the water with calcium carbonate...... These indices do not predict metal corrosion whatsoever. When one refers to water being "corrosive" in terms of these indices, it is only in reference to the dissolving of calcium carbonate as a component of plaster (plaster is mostly calcium oxide in a hydrated silicate).
    So the Pool Store is telling you a bunch of baloney about corrosion. And, as stated in the many replies, your CH is absolutely fine for a vinyl pool.
    Last edited by JoyfulNoise; 05-29-2015 at 05:14 PM. Reason: shortening quote and typos
    Matt
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    BoDarville's Avatar
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    Re: Store says Increase CH in vinyl pool

    Supporting what the other responders have stated...

    Your CH is fine - no need to adjust it.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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    Re: Store says Increase CH in vinyl pool

    I concur with the other. My recommendation would be to buy your own recomended test kit and stay away from the pool store.
    Lisa
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    Mod Squad Bama Rambler's Avatar
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    Re: Store says Increase CH in vinyl pool

    I've had zero ch for 5 years and have had absolutely no problems. I started it as a test, and I think 5 years is a pretty good test.
    Dave J. TFP Moderator
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    Divin Dave's Avatar
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    Re: Store says Increase CH in vinyl pool

    hummm... I trying to thing of something of something brilliant or dazzling to say, but its Saturday morning and I have to think too hard at work, so Im taking a break on thinking.
    So, in regard to your vinyl pool needing CH, I will just say 'hogwash'!
    Divin Dave,
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    Richard320's Avatar
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    Re: Store says Increase CH in vinyl pool

    Too bad you're so far away. You could come over with an empty bucket and get some of my pool water and raise the CH in your pool for free.

    It might be interesting to note that auto manufacturers prefer there be no Calcium in the radiator coolant. And they deal with interesting combinations of iron, steel, brass, copper, and aluminum.

    The pool store clerk is just following the preprinted guidelines. You need Calcium because people with plaster pools need Calcium and the pool store needs the sale.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Store says Increase CH in vinyl pool

    Quote Originally Posted by Richard320 View Post
    Too bad you're so far away. You could come over with an empty bucket and get some of my pool water and raise the CH in your pool for free.
    That is hilarious!


    30K gallon IG vinyl. 1.5HP 2-speed Waterway Mustang pump. 600 lb sand filter. Polaris 280. Circupool SI-60+. TF-100

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    Re: Store says Increase CH in vinyl pool

    I added calcium to my liner pool. Fill water was CH 20, so when water was balanced I still had a CSI of -1.11. The quoted article seems to discuss positive CSI values. I understand the need for calcium in a plaster pool, however, I had believed that the CSI was of some value when considering a vinyl pool and associated hardware. Is that not the case?

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    Mod Squad jblizzle's Avatar
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    Re: Store says Increase CH in vinyl pool

    You can not leech calcium out of vinyl, so low CSI does not matter.
    Jason, TFP Moderator
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    Re: Store says Increase CH in vinyl pool

    OK, got that, but maybe I need to ask this question, instead: "Is there any index to describe the aggressiveness of pool water towards metals, such as those found in pumps, filters, heaters, etc?"

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    JoyfulNoise's Avatar
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    Store says Increase CH in vinyl pool

    Quote Originally Posted by ewkearns View Post
    OK, got that, but maybe I need to ask this question, instead: "Is there any index to describe the aggressiveness of pool water towards metals, such as those found in pumps, filters, heaters, etc?"
    See the link in my previous post. That thread has a detailed discussion of different indices and has some web links to external sites on corrosion of metal.

    Problem with metal corrosion indices is that they are specific to different metals and their alloys and usually require the measurement of dissolved oxygen, sulfur compounds and other chemicals that one does not typically test for in pool water. They are also typically specific to closed water systems (steam boilers etc) and not open systems like pools.


    Matt
    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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    Re: Store says Increase CH in vinyl pool

    Don't believe the pool store. I had this exact same issue too. I now have a bucket of CH that just sits there.
    20x40 L-shape 35k gallons, Pentair FNS 60 SQFT DE Filter, Pentair Multi-port Valve, Hayward Super Pump w/1 glorious HP, Vinyl Liner, Dolphin Z5, TF-100 w/Speed Stir

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