Welcome to Our Community

Wanting to join the rest of our members? Feel free to sign up today.

How long does dechlorinator remain active

Discussion in 'Coldwater Fish and Ponds' started by seangee, Jun 24, 2019.

  1. seangee

    seangee Member

    Joined:
    Feb 16, 2008
    Messages:
    1,782
    Likes Received:
    261
    Location:
    Berks
    There is an unusually high amount of organic waste in the pond this year, possibly as a result of the unusual weather. Yesterday I did an impromptu 80% water change. Since I had a bottle of Seachem Prime that won't get used (I have switched my tanks to RO) I decided to use that. I dosed for the volume of the entire pond. About 4 hours into the re-filling I went out to dinner and reduced the hosepipe to a trickle. I turned it back onto full when I came in. By the time I turned the tap off it was about 8 hours since I had put the Prime in.

    This morning I turned the tap back on for the last few litres (probably about 5% of the volume). By the time the pond was full it was about 16 hours since I put the Prime in. I'm curious as to whether it was still reducing the chlorine at this time.
     
  2. Deanasue

    Deanasue Moderator
    Staff Member Moderator Global Moderator Tank of the Month Winner!

    Joined:
    Oct 29, 2018
    Messages:
    3,712
    Likes Received:
    530
    Location:
    USA
    I’d add a little more to be safe.
     
    • Agree Agree x 1
  3. Byron

    Byron Member

    Joined:
    Feb 25, 2009
    Messages:
    10,091
    Likes Received:
    1,268
    Location:
    CA
    This is a question I would put directly to Seachem if I were you. They have a contact email on their website and are very good at responding within hours usually.

    I do know that in correspondence with me on the effectiveness of Prime with respect to detoxifying ammonia, nitrite and nitrate, they stated that Prime would be effective at this for 24-36 hours, after which the ammonia/nitrite/nitrate will revert back to the toxic form if still present. Also we discussed heavy metals and adding Flourish Comprehensive with/after Prime since Prime detoxifies heavy metals, and their advice was that after 24 hours the fertilizer could be added (and not at the same time or immediately after Prime) and it would not likely be nullified by Prime, though 36 hours would be certain.
     
  4. Guppylover3x

    Guppylover3x Fish Addict
    Tank of the Month Winner!

    Joined:
    Jan 8, 2019
    Messages:
    717
    Likes Received:
    138
    Location:
    UK
    I agree with Deanasue.

    I always add more to be on the safe side. It doesn’t do any harm to the fish.

    Good luck!
     
  5. seangee

    seangee Member

    Joined:
    Feb 16, 2008
    Messages:
    1,782
    Likes Received:
    261
    Location:
    Berks
    Well its small for a pond but at 7000 litres it would be adding a lot more :whistle:
    The question was idle curiosity about the de-chlorination. My water supply uses free chorine rather than chloramine and ammonia is not an issue. I know that Seachem do recommend a lower dosage of their Safe product for ponds than aquaria because of the relatively larger surface area, and I used the aquarium dosage. In my case the chlorine would gas out way faster than in a tank because (when empty) the hose drops the water in from a height of 1 1/2 metres. At the other end the filter return drops by a full metre (again when empty). I also have 6 airstones running so while filling there is a good deal of surface agitation going on
     
  6. Back in the fold

    Back in the fold Fish Addict

    Joined:
    May 25, 2019
    Messages:
    942
    Likes Received:
    188
    Location:
    Billings Montana USA
    I would like to know the science behind how these chemicals really work. I don't understand how one chemical kills another and then disappears. Sounds like voodoo science. I'm from the Dr. Innes era where we aged our water. I still do.
     
  7. seangee

    seangee Member

    Joined:
    Feb 16, 2008
    Messages:
    1,782
    Likes Received:
    261
    Location:
    Berks
    Hmmm - 7000 litres is a lot of water to store though.

    That's all very well when your tap water is treated with free chlorine. A lot of water companies use chloramine because its more cost effective and "lasts longer". Unfortunately aging doesn't make it go away.
     

Share This Page

Search tags for this page

how long does a pond dechlorinator last