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  1. #41
    Member Rank = Tosai Jim239's Avatar
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    Quote Originally Posted by Feline View Post

    I personally have a big blue and 3 20” jumbo pods on the top up. My drum cleans using clean side water so the pond level would drop if `I wasn’t always trickling in. But if`I ever drop the pond level significantly when doing filter maintenance, BD purges etc, I use some ST so I can turn the tap full on and refill quickly without worrying about any chlorine passing.
    Hi Feline, do you run your supply for the top up through the large blue cylinder declorinator first then through a three pod? I am trying to work out what to do on my supply for the top up tank to compensate for the drum cleans.

    Just curious as to why you have both if the first cylinder deals with the chlorines? I have been told I have chloramine in my supply so I want something to deal with that especially after all the trouble people have been having and trusting the water company. Will take my tin foil hat off and go back and hide in the corner now

  2. #42
    Senior Member Rank = Yonsai bicolormoth's Avatar
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    Jim239, i got mine from Coastal Koi. see the link. if you have questions call Dave at CK, he's on the ball https://www.coastal-koi.com/shopping.php?class_id=73
    5000g, Drum Filter/Gravity, + MBB, Skimmer-Sieve-Shower.

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  4. #43
    Moderator Rank = Supreme Champion Feline's Avatar
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    Yes if you want to use ST instead of dechlorinator pods/ big blue units then you need to make sure there is always enough ST in the water before you add the tap water. That’s where the problem lies really. Even if you do test the tap water chlorine/amine level and do a clever calculation for how much ST per day you need to add, that doesn’t allow for water companies messing with the supply in hot weather etc.

    ST is pretty safe in ‘overdose’. But if you ever need to treat your pond with PP and you’ve been adding excesses of ST to it for months on end you will have to add the mother load of PP to get to the right redox reading

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  6. #44
    Member Rank = Tosai Jim239's Avatar
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    Quote Originally Posted by bicolormoth View Post
    Jim239, i got mine from Coastal Koi. see the link. if you have questions call Dave at CK, he's on the ball https://www.coastal-koi.com/shopping.php?class_id=73

    Thanks for the recommendation, I will give them a call. Just looking at their website on the big blue cylinders with a pre filter. Some have catalytic carbon? To deal with chloramines.

    Trying to do some research while at work on my phone but struggling to find info on catalytic carbon and it’s benefits over standard carbon.

    Jim

  7. #45
    Senior Member Rank = Yonsai jphamill's Avatar
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    I go looking for info re a replacement for EA dechlorinator which does not really work at even at a trickle , before we even get to Nexus flush and I find this.answer and chart.

    Have Prime for the indoor tanks but need to scale up.

    ST crystals ordered.

    Brilliant thanks Syd.

    Quote Originally Posted by Manky Sanke View Post
    Yes, I agree and, to put sodium thiosulphate toxicity into perspective, the amounts I calculated in my table are a little on the high side for the normal chlorine/chloramine level in the average supply because the level is occasionally increased to sterilise pipes etc. However, these increased levels are safe to use because, although there is no research that I can find for the toxicity of sodium thiosulphate on carp, the toxic threshold for other fish species is between 10,000 mg/L - 24,000 mg/L. This is far in excess of the 3 grams per 1,000 litres (3 mg/L) base value I used to calculate my chart so, although my values are a little high, they are 3,000 to 8,000 times less than the toxic level.

    So, people can safely use three or four times the amount in my chart if their water authority should dramatically increase the concentration in the supply to the point that there is a strong smell of chlorine when they run the tap.


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  9. #46
    Senior Member Rank = Yonsai jphamill's Avatar
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    Big blue or vyair can i hear some recommendations please, slow trickle and nexus 220 auto cleaning every 2 days. Liquid ST added those days.
    Thanks

    Sent from my SM-G973F using Tapatalk
    2700 G Above ground, Nexus 220, EA 24 bead, 1m 2 tier custom Evolve shower 9kW Thermotech ASHP

  10. #47
    Senior Member Rank = Jussai Djstiles999's Avatar
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    I have a big blue and very happy with it, £100 odd to refill with carbon and probably need to do it once a year on my current rates

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  12. #48
    Member Rank = Tosai Jim239's Avatar
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    Anybody know if the catalytic carbon fills for the big blue are worth the extra cost?

  13. #49
    Moderator Rank = Supreme Champion Feline's Avatar
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    Quote Originally Posted by Jim239 View Post
    Anybody know if the catalytic carbon fills for the big blue are worth the extra cost?
    Andy Finch is very impressed with it, and he is well worth listening to on this subject.
    I intend to buy some of that from him next year for my big blue.

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  15. #50
    Member Rank = Tosai Jim239's Avatar
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    Quote Originally Posted by Feline View Post
    Andy Finch is very impressed with it, and he is well worth listening to on this subject.
    I intend to buy some of that from him next year for my big blue.
    Thanks for the info, I will probably give it a go. Just working out if I can accommodate the big 4ft one and will order it from costal koi tomorrow. Dont think they were getting anymore in till some time in October though but I will just use ST for now until I can get the big blue plumbed into my top up tank.

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