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Thread: Acid neutralizer question

  1. #1
    DIY Senior Member Bob999's Avatar
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    Default Acid neutralizer question

    I have a backwashing acid neutralizer with a 12 x 48 tank.

    My question is how much Calcite media should be maintained in the tank?

  2. #2
    That's all folks! Gary Slusser's Avatar
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    You should add mineral when the treated water pH starts going below 7.0 at high flow rates.
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    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by Andy CWS View Post
    A 12 x 48 inch tank will have 2 cuft (or about 200 lbs) of calcite in it. It will have about 20 pounds of gravel at the base.

    The tank should be about 2/3 full or a minimum of 24" bed depth. Is it mixed with corosex or just calcite. What is your raw pH?

    Andy Christensen
    The media is Calcite, no corosex. The raw pH is 6.5.
    Last edited by Bob999; 07-24-2009 at 06:00 AM.

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    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by Andy CWS View Post
    Yew, the Calcite alone would work fine. I suppose your pH raises to around 7.3-.4? Can you desribe your water usage. # of people, baths, plumbing diameter before and after the filter. Have you tested for hardness before and after?

    Andy
    I suppose your pH raises to around 7.3-.4? --It depends on flow rate. At high flow rates it will drop to 7.2 or less while at low flow rates it will be 7.8-8.0,
    2 people in home, 4.5 baths, 1" plumbing in to AN filter and out to softener. Welll produces 30 gpm and pump produces 25 gpm. Hardness goes from about 5 gpg raw to 7-8 gpg after AN filter.

    pH characteristic of water is that it measures acidic immediately after being drawn but if allowed to sit for a day the pH will rise to above 7--perhaps as high as 7.5.
    Last edited by Bob999; 07-25-2009 at 11:10 AM.

  5. #5
    Radon Contractor and Water Treatment 99k's Avatar
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    The minimum will be up for debate, however, the maximum level of calcite should provide a clearance of 18" or greater from the control head.

  6. #6
    That's all folks! Gary Slusser's Avatar
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    I've never seen 'calcite' alone raise pH to more than 7.3 or so.

    I still say the time to add more mineral is when the max peak demand flow rate shows a pH of 7.0 or less.

    99K, you say that is debatable, when would you suggest Bob999 adds mineral?
    Gary Slusser Retired (= out of business)
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    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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    That's all folks! Gary Slusser's Avatar
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    IMO most if not all homeowners will have a tough time getting an accurate CO2 test.

    If a bed needs to be replaced, I 'd say there was insufficient backwashing but the question was when to add more mineral.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by wellexpert View Post

    A properly sized neutralizer should have to be filled once a year to the correct level. Most neutralizers need a re bed every 2 years.

    wellexpert
    I already have my AN tank and I am commited to filling it as needed.

    So--What is the "correct level" to which the AN should be filled?

    Why do "Most neutralizers need a re bed every 2 years." and how do I tell if my filter needs a rebed?

  9. #9
    That's all folks! Gary Slusser's Avatar
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    I've sold many AN filters over the last 22 years and I've never had a customer have a problem with channeling, probably because the backwash is done properly and frequently enough to prevent channeling. Backwashing is the only way to cure channeling.

    That will also prevent "impurities" from getting down in the bed. But what are these impurities actually?
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by Gary Slusser View Post
    I've sold many AN filters over the last 22 years and I've never had a customer have a problem with channeling, probably because the backwash is done properly and frequently enough to prevent channeling. Backwashing is the only way to cure channeling.

    That will also prevent "impurities" from getting down in the bed. But what are these impurities actually?
    Gary,

    What do you recommend for backwashing my AN filter? It is a 12 x 48 tank, media is calcite only, and the DLFC is 7 gpm.

  11. #11
    That's all folks! Gary Slusser's Avatar
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    Depending on how many people and any iron, backwash it every 3-4 days. Two people no iron, 4-6 days.

    The 7 gpm may be too small.

    What brand and model control valve are you using?
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  12. #12
    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by Gary Slusser View Post
    Depending on how many people and any iron, backwash it every 3-4 days. Two people no iron, 4-6 days.

    The 7 gpm may be too small.

    What brand and model control valve are you using?
    The control valve is a ProFloSE. As best I can determine 7gpm is the largest flow button available for my configuration (5/8" OD for the flow control button). I have very small amounts of iron (0.1 mg/l) and manganese (0.16 mg/l). 2 people in home.

    How long should the backwash and rinse be?

  13. #13
    That's all folks! Gary Slusser's Avatar
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    I'd go 14-16 minutes if one backwash and then 6-8 minutes rinse. If two backwashes 6-8 and then 6-8 again and 6-8 rinse.

    You could do away with the DLFC button and get a 10 gpm Dole flow control. But that's not necessary for a 2.0 cuft. And actually, you could have used a 1.5' and got a deeper bed depth, and a top dome hole type tank. IIRC 2.0' doesn't come with a TDH tank right? And a 12" x 48" doesn't get the proper freeboard area; I use 12 x 52" tanks but not for AN filters. You need bed depth, not a wider column.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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    DIY Senior Member Bob999's Avatar
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    Quote Originally Posted by Gary Slusser View Post
    IIRC 2.0' doesn't come with a TDH tank right? You need bed depth, not a wider column.
    The 12 x 48 tank I have does have a top dome hole--it is a Structural Brand tank.

    Thanks for the advice on the backwash.

  15. #15
    That's all folks! Gary Slusser's Avatar
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    I can never remember about the 2.0' tanks.

    You're welcome.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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