Acid neutralizer question

Discussion in 'Water Softener Forum, problems, installation and r' started by Bob999, Jul 23, 2009.

  1. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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. Gary Slusser

    Gary Slusser That's all folks!

    You should add mineral when the treated water pH starts going below 7.0 at high flow rates.
  3. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    The media is Calcite, no corosex. The raw pH is 6.5.
    Last edited: Jul 24, 2009
  4. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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: Jul 25, 2009
  5. 99k

    99k Radon Contractor and Water Treatment

    Messages:
    460
    Location:
    Fairfield Co.,Connecticut
    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. Gary Slusser

    Gary Slusser That's all folks!

    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?
  7. Gary Slusser

    Gary Slusser That's all folks!

    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.
  8. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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. Gary Slusser

    Gary Slusser That's all folks!

    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?
  10. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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. Gary Slusser

    Gary Slusser That's all folks!

    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?
  12. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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. Gary Slusser

    Gary Slusser That's all folks!

    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.
  14. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    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. Gary Slusser

    Gary Slusser That's all folks!

    I can never remember about the 2.0' tanks.

    You're welcome.
  16. Bob999

    Bob999 In the Trades

    Messages:
    448
    Location:
    Pennsylvania
    Is your recommendation that this backwash/rinse be done every 3 to 4 days because of the iron (0.1 mg/l) and manganese (0.16 mg/l) in my water?
  17. Gary Slusser

    Gary Slusser That's all folks!

    Based on what you have said so far you could.
  18. shas

    shas New Member

    Messages:
    1
    Location:
    Maryland
    Help with backwashing

    I need to add a couple 50 lb bags of Calcite to my system. What do I need to know about backwashing? I'm not sure how to do it -- don't recall if the installer ever mentioned it. I don't believe I have an automatic system. I have a top-flow tank with no electronic controls at the top. Other than shutting valves and funneling in the bags, what do I need to know about backwashing? Thanks in advance.
  19. Gary Slusser

    Gary Slusser That's all folks!

    You have an upflow filter meaning there is no control valve so the water goes down the distributor tube and up through the mineral and out to the fixtures. So you need to run water somewhere other than in a septic tank to get rid of any discolored water after refilling the tank with new mineral.
Similar Threads: Acid neutralizer
Forum Title Date
Water Softener Forum, problems, installation and r Is it safe to run chlorine water into acid neutralizer from well shock treatment? May 21, 2013
Water Softener Forum, problems, installation and r Low water pressure from water coming out of acid neutralizer. Bypass pressure is OK May 19, 2013
Water Softener Forum, problems, installation and r Recommendations on Acid Neutralizers Dec 10, 2012
Water Softener Forum, problems, installation and r Please help with acid neutralizer questions Apr 6, 2012
Water Softener Forum, problems, installation and r Acid Neutralizer suggestions Mar 10, 2012

Share This Page