(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 12 of 12

Thread: brine/slow rinse question

  1. #1
    DIY Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default brine/slow rinse question

    As I understand softener regeneration, brining and slow rinse happen with the same value position except that slow rinse happens after no more brine is being drawn. Is the main purpose of slow rinse to push the remaining brine through the resin? Other than that, does slow rinse do anything that fast rinse can't? What is the rule for how long brine/slow rinse should last?

  2. #2
    In the Trades Akpsdvan's Avatar
    Join Date
    Dec 2009
    Location
    Alaska
    Posts
    1,464

    Default

    You are on the right track for understanding the brine/slow rinse.
    There are 2 reasons for the slow rinse, remove the extra brine but more overly to give the brine and resin time to inter act with each other, ie to fast or moving to the rapid rinse will not give the brine time to recharge the resin and lower the capacity of the resin.

    Most down flow brine times are about 40-50 minutes, but that also depends on the size of the system, larger systems will have a longer time frame for the brine/slow rinse.

  3. #3
    DIY Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default

    But once all the brine is pushed through the resin, aren't the brine and resin done interacting, or is there still some regeneration reaction still going on within the resin that requires slow rinse to continue?

    How long does slow rinse need to go after all the brine is pushed through? A fixed time per cuft? Longer if the salt dose is significantly raised, say 6 to 15 lbs/cuft? (That's what my earlier question was more about.)

    You say "removing extra brine". I assume there really isn't any "extra" brine to be "removed". The resin should still be exposed to the full salt dose, shouldn't it?

  4. #4
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,676

    Default

    All of the brine does not stay in the resin. Only the sodium exchanges and the chloride goes to the drain.

  5. #5
    DIY Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default

    Quote Originally Posted by LLigetfa View Post
    All of the brine does not stay in the resin. Only the sodium exchanges and the chloride goes to the drain.
    Yes. But once the slow rinse fills the tank/resin with fresh water, is slow rinse essentially done?

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,676

    Default

    First off, the first part of the slow rinse is brine draw, not refill and when the brine runs out, it's just rinse, not refill. Look at the column of brine as long. In a downflow regen, the top of the bed is the most regenerated and it takes longer for the brine to reach the bottom of the bed as does the clear water rinse.

  7. #7
    DIY Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default

    Understood. But when it's just slow rinse and drain water is no longer not salty, has slow rinsing essentially done it's job or is something still happening with the resin, other than just softening the clear rinse water? I'm guessing slow rinse continues for as long as it does just to provide a margin.

  8. #8
    DIY Senior Member mialynette2003's Avatar
    Join Date
    Nov 2010
    Location
    Ocala, Florida
    Posts
    663

    Default

    I don't believe you will find that the salt is completely rinsed from the resin at the end of the slow rinse. If so, you would not need a fast rinse.

  9. #9
    DIYer, not in the trades LLigetfa's Avatar
    Join Date
    Feb 2011
    Location
    NW Ontario, Canada
    Posts
    3,676

    Default

    Quote Originally Posted by teve View Post
    I'm guessing slow rinse continues for as long as it does just to provide a margin.
    I think the same. My low tech head has fixed cams so the shorter the brine stage, the longer the rinse which is designed to be adequate for the highest salt dose.

    I think the fast rinse is more about the pack than the rinse.

  10. #10
    DIY Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default

    I can maybe see more rinsing time being needed after a "tank volume" of clear water flowing in, since remaining brine might mix with the clear incoming water.


    Quote Originally Posted by LLigetfa View Post
    so the shorter the brine stage, the longer the rinse which is designed to be adequate for the highest salt dose.
    This relates to my original question. Is there a general rule about the ratio of the time for drawing brine to not drawing brine? 50:50? 40:60? 60:40? Or a fixed time per cuft after brine is all drawn?
    Last edited by teve; 11-22-2011 at 07:25 AM.

  11. #11
    That's all folks! Gary Slusser's Avatar
    Join Date
    Aug 2004
    Location
    Wherever I park the motorhome.
    Posts
    6,790

    Default

    The cycle is slow rinse/brine draw.

    The slow rinse flow actually draws the brine from the salt tank so it flows for the length of time set for the cycle to finish.

    The brine flow/time should be finished in the frist 10-20 minutes of the slow rinse/brine draw cycle time.

    As to how long the cycle time should be, I don't know of any formula although in the science behind softeners there probably is one and it probably has to do with the salt dose being used but, as has been said, it is usually about 40-60 minutes depending on the type and cuft volume of resin used.

    I would not suggest attempting to micro manage the cycle time. The flow is usually no more than a half gallon per minute.

    Rapid rinse is used to repack the resin bed, and it will remove any left over brine if any.
    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 Member teve's Avatar
    Join Date
    Aug 2011
    Location
    Minnesota
    Posts
    57

    Default

    Quote Originally Posted by Gary Slusser View Post
    I would not suggest attempting to micro manage the cycle time.
    Don't worry. I'm not going to micro-manage my softener valve. It's not designed to be micro-managed.

    Thanks to all for the responses.

Similar Threads

  1. What Causes the Brine Draw to be Very Slow in Water Softener?
    By Biddle in forum Water Softener Forum, problems, installation and reviews
    Replies: 14
    Last Post: 04-06-2011, 09:26 PM
  2. How does the dshwshr rinse agent get into the rinse?
    By tototalitarian in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 8
    Last Post: 11-08-2009, 06:15 PM
  3. Slow Brine fill on new Fleck 7000SXT
    By snortindog in forum Water Softener Forum, problems, installation and reviews
    Replies: 8
    Last Post: 09-09-2009, 02:36 PM
  4. Brine Tank Question
    By Truckman in forum Water Softener Forum, problems, installation and reviews
    Replies: 6
    Last Post: 06-20-2009, 09:58 PM
  5. pre-rinse faucet
    By jj hh in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 11-26-2007, 07:43 AM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •