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  1. #1
    Extreme Koi Member Rank = Sansai dshaw63's Avatar
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    De chlorination units

    Hi All advise pls, what are people using for chlorine removal as i think school boy error and topping up pond with tap water untreated and killing off de nitrifying bacteria. Hopefully answer to many previous problems. Many thanks Dean ??



  2. #2
    Activated carbon in cylinder

  3. #3
    If you have already topped up your pond with tap water you may have already wiped out your filters but if not you could try some ST or tap water conditioner to remove the chlorine ASAP? Chlorine does tend to gas off over a few days anyway so maybe get some DPD4 tablets, check for chlorine and go from there? Test your pond water for Ammonia, Nitrite and Nitrate and see if the readings are rising or staying the same at least then you will know what state your filters are in possibly?

  4. #4
    Moderator Rank = Supreme Champion Feline's Avatar
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    I use a big (3 foot high) bottle of activated charcoal followed by a 20" 3 pod dechlorinator unit I got from Vyair.

    For general top ups and/or slow trickle in the 20" 3 pods on their own can work ok so long as you keep an eye on. cartridge age and test the output from time to time for chlorine passing with DPD4 tablets.
    I would definitely not recommend any of the small 10" dechlorinator pod setups though, they are not capable of the flow rate needed for ponds.
    There are some jumbo chunky single pods available these days for if you don't think you need a sediment cartridge before the main dechlorinating carbon ones.

    Once upon a time I bought one of the flow through EA ones- it could only cope with a tiny trickle and not refillable at the end of its life without a bodge, so I would not recommend them myself.

  5. #5
    Senior Member Rank = Mature Champion RS2OOO's Avatar
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    Quote Originally Posted by Feline View Post
    I use a big (3 foot high) bottle of activated charcoal followed by a 20" 3 pod dechlorinator unit I got from Vyair.

    For general top ups and/or slow trickle in the 20" 3 pods on their own can work ok so long as you keep an eye on. cartridge age and test the output from time to time for chlorine passing with DPD4 tablets.
    I would definitely not recommend any of the small 10" dechlorinator pod setups though, they are not capable of the flow rate needed for ponds.
    There are some jumbo chunky single pods available these days for if you don't think you need a sediment cartridge before the main dechlorinating carbon ones.

    Once upon a time I bought one of the flow through EA ones- it could only cope with a tiny trickle and not refillable at the end of its life without a bodge, so I would not recommend them myself.
    If limited on height-space the 10" jumbo units will do the job. I'm still in testing phase with mine and going to do a write up very shortly, but there's no chlorine coming through at 7.8 litres per minute.

    My hose won't produce water any faster than that so can't test at higher levels, but suspect 10lpm would be fine.

    If anyone needs tips on what to buy just say, and I can start writing up what I've discovered so far.

    Although I don't believe incoming water needs purifying at all in some locations, just adding ST to dechlorinate top-ups might be adequate. In these instances the risk of not having one would become apparent if they did major supply works in your area and added chemicals to clear out the pipes, in that situation a purifier could prevent your fish being killed.

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